CN117351738B - A step-by-step transition adjustment method for traffic organization during road closure construction - Google Patents
A step-by-step transition adjustment method for traffic organization during road closure construction Download PDFInfo
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Abstract
本发明公开了一种面向道路全封闭施工的交通组织逐级过渡调整方法，涉及交通管理与控制技术领域，包括获取施工路段周边路口近一个月的卡口过车数据、路口信号控制方案数据和路口渠化数据，在道路全封闭施工前通过调整交通信号配时和进口车道方向的方式逐步减少施工路段上、下游路口各个方向通往施工路段的车流量，以达到逐步减少施工路段通行流量的目的，再对施工道路通行流量逐步减少的周边路口交通组织逐级调整，如此，一方面，逐步减流留给驾驶员一个逐渐的适应过程，另一方面，能够有效保障周边路口交通组织方案的可行性，从而避免大面积交通拥堵或交通瘫痪现象的发生。
The invention discloses a method for step-by-step transition adjustment of traffic organization for road full closure construction, which relates to the technical field of traffic management and control, including obtaining checkpoint passing data, intersection signal control scheme data and intersection channelization data of the surrounding intersections of the construction section for nearly one month, and gradually reducing the traffic flow leading to the construction section from all directions of the upstream and downstream intersections of the construction section by adjusting the traffic signal timing and the direction of the import lane before the road is fully closed for construction, so as to achieve the purpose of gradually reducing the traffic flow of the construction section, and then gradually adjusting the traffic organization of the surrounding intersections where the traffic flow of the construction road is gradually reduced. In this way, on the one hand, the gradual flow reduction leaves a gradual adaptation process for the driver, and on the other hand, it can effectively ensure the feasibility of the traffic organization scheme of the surrounding intersections, thereby avoiding the occurrence of large-scale traffic congestion or traffic paralysis.
Description
Technical Field
The invention relates to the technical field of traffic management and control, in particular to a gradual transition adjustment method of traffic organization for road totally-enclosed construction.
Background
Along with the acceleration of urban process in China, the road infrastructure construction projects are increased, the influence degree of road construction is increased, the construction period of the road is longer, and the problems of traffic jam and the like of intersections around the construction road section are caused. How to effectively make traffic organization management work during road construction and construction, and effectively overall relation between traffic diversion and construction, has become a major concern for urban road construction. The current construction road section surrounding intersection traffic organization method adopts a set of fixed traffic flow diversion and fluffing scheme according to the design experience of traffic engineers and the management experience of traffic police, the method does not conduct quantitative analysis according to the traffic demand of the construction road surrounding intersection, has great limitation, and is difficult to effectively divert the traffic of the construction road section surrounding intersection.
In the existing proposed improved technical method, for example, patent CN112950940B, firstly, a traffic impact area of a construction road section is determined based on the service level of a road junction around the construction road section, then vehicles are split according to the service level load degree of the road in the traffic impact area, different traffic split schemes are obtained, then the traffic split schemes are subjected to simulation evaluation by using VISSIM software, and an optimal set of traffic split schemes is selected. Although the method obtains the traffic organization scheme of the road junction around the construction road on the premise of analyzing the traffic demand of the road junction around the construction road, for the totally-enclosed construction road, due to the rapid increase of traffic diversion pressure, if the scheme is directly implemented in the case, on one hand, traffic disorder is likely to be caused due to the fact that a driver is difficult to adapt the scheme in a short time, and on the other hand, traffic disorder is likely to be caused due to the fact that the scheme does not completely meet the traffic release condition of road network traffic or the traffic flow change in different time periods, which brings adverse effects to traffic jam around the construction road, and large-area traffic paralysis is likely to be generated in the short term of implementation of the scheme.
Therefore, research on a reasonable adjustment method for the traffic organization around the construction road is needed, the applicability of traffic diversion of the road around the road after the totally-enclosed construction is improved, and the occurrence of large-area traffic jam is effectively avoided.
On one hand, a gradual adaptation process is reserved for drivers, on the other hand, the implemented scheme is tracked, evaluated and adjusted in time, and finally, a set of road traffic organization implementation schemes which are adapted to the drivers and meet road network traffic release conditions and different time period traffic flow change requirements are determined under the road totally-enclosed construction conditions, so that the applicability of traffic diversion of the road surrounding the road totally-enclosed construction is improved, and the occurrence of large-area traffic jam is effectively avoided.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a gradual transition adjustment method for traffic organizations of road totally-enclosed construction, which gradually reduces the traffic flow of the construction road sections to the construction road sections in each direction of the upper and lower road junctions by adjusting the traffic signal timing and the inlet lane direction according to the traffic crossing data, the signal phase timing data and the crossing canalization data of the road junctions of the construction road sections in the vicinity of one month, so as to achieve the purpose of gradually reducing the traffic flow of the construction road sections, and then gradually adjusts the traffic organizations of the road junctions of the construction road with gradually reduced traffic flow, on one hand, gradually reduces the flow and reserves a gradual adaptation process for drivers, and on the other hand, can effectively ensure the feasibility of the traffic organization scheme of the road junctions of the periphery, thereby avoiding the occurrence of large-area traffic jam or traffic paralysis.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a road totally-enclosed construction-oriented traffic organization gradual transition adjustment method comprises the following steps:
(1) Acquiring the data of the passing of vehicles at the entrance of the road around the construction road section, the data of the signal control scheme of the road junction and the data of the canal formation of the road junction, and cleaning, matching and calculating the data to obtain the design data of the one-hour traffic flow of the road around the construction road section, wherein the design data of the traffic flow of the road junction is different in average one-day different inlet flow directions and time intervals;
(2) The traffic flow of the construction road section in all directions of the road junction at the upper and the lower sides is gradually reduced by adjusting the traffic signal timing and the direction of the entrance lane before the road totally-enclosed construction, so as to achieve the purpose of gradually reducing the traffic flow of the construction road section:
2.1 Determining a first reduction proportion of the traffic flow of the construction road section, reducing traffic flow design data of the construction road section which is converged into each flow direction of different inlets of an upstream road section and a downstream road section according to a set proportion, and redistributing the traffic flow reduced by the flow direction of the construction road section to other flow directions to obtain adjusted traffic flow design data of each flow direction;
2.2 Calculating the adjusted total cycle flow rate ratio Y of the intersection, and judging whether the adjusted total cycle flow rate of the intersection is smaller than a threshold value or not;
① If the adjusted total period flow rate of the intersection is smaller than the threshold value, the next step can be carried out;
② If the inlet lane allocation scheme is optimized, the total cycle flow rate of the intersection after adjustment cannot be made smaller than the threshold value, the upstream intersection corresponding to the flow direction corresponding to the maximum value of the ratio of the traffic flow rate of the intersection needs to be found to limit the flow until the total cycle flow rate of the intersection after adjustment is smaller than the threshold value;
2.3 Calculating saturation of each flow direction, and judging whether each flow direction is in saturation state
① If all the flow directions are not in a saturated state, a preliminary construction road section surrounding intersection traffic flow guiding and untwining scheme is obtained;
② If the inlet lane distribution scheme and the signal timing are not adjusted so that the inlet flow direction can not meet the conditions, the upstream intersection corresponding to the flow direction needs to be found for limiting the flow, and the upstream intersection also needs to be re-optimized according to the method for timing, lane or limiting the flow of the upstream intersection until the saturation of each inlet flow direction of the upstream intersection is calculated to be smaller than a threshold value;
2.4 After the preliminary construction road section surrounding road junction traffic flow guiding and untwining scheme is realized for a period of time, the traffic flow of the construction road section is gradually reduced according to the steps until the traffic flow of the construction road section is reduced by 100%, and the construction road section is totally closed.
The gate passing data comprise a passing id, an intersection number, an entrance way direction, a flow direction, a lane number, a license plate number, a vehicle type and a passing time;
the intersection signal control scheme data comprise intersection time period division data, phase scheme design data and intersection signal timing data.
The step (1) of obtaining the one-hour traffic flow design data of different inlet flow directions of the average day of the surrounding intersections of the construction road section in time intervals comprises the following steps:
① Acquiring the traffic data of each inlet flow direction of the construction road section surrounding road junction in one month at different time periods;
② Calculating the maximum 15min traffic flow data of each inlet flow direction of each intersection at the periphery of the construction road section in one month, and adding and averaging to obtain the maximum 15min traffic flow data of each inlet flow direction of each day at each time interval:
wherein, A sum of maximum 15min traffic flow data representing one of the ingress flows for one period of time within one month;
③ Determining the design data of the average one-hour traffic flow of different inlet flow directions of a construction road section surrounding road on average in one day and in time intervals:
the steps of redistributing the traffic flow reduced to the flow direction of the construction section to other flow directions are as follows:
North import left turn q' nl＝(1-α)qnl;
The north import goes straight:
North import right turn:
south import left turn:
the south import goes straight:
Q s′r＝(1-α)qsr, right turn of south entrance;
left turn of west import:
The Western import goes straight, q' wt＝(1-α)qwt;
west import right turn:
Left turn at east entrance q' el＝(1-α)qel;
the east entrance goes straight q' es＝(1-α)qes;
right turn east entrance q' er＝(1-α)qer;
Q nl、qnt、qnr is traffic flow design data of left, right and left directions of the north entrance of the intersection, q sl、qst、qs is traffic flow design data of left, right and left directions of the south entrance, q wl、qwt、qwr is traffic flow design data of left, right and left directions of the west entrance, and q el、qet、qer is traffic flow design data of left, right and left directions of the east entrance; the method comprises the steps of setting a flow rate reduction ratio of a construction road section, setting q ' nl、q′nt、q′nr as flow rate design data of the north inlet after left, right and left flow directions are adjusted, setting q s′l、qs′t、qs′r as flow rate design data of the south inlet after left, right and left flow directions are adjusted, setting q ' wl、q′wt、q′wr as flow rate design data of the west inlet after left, right and left flow directions are adjusted, and setting q ' el、q′et、qe′r as flow rate design data of the east inlet after left, right and left flow directions are adjusted.
The step of calculating the adjusted total cycle flow rate ratio Y of the intersection is as follows:
(2) Determining a vehicle flow rate ratio:
Wherein y i represents the ratio of the flow rates of the traffic flow of each inlet flow direction of the intersection, q i represents the traffic flow design data of each inlet flow direction of the intersection, N i represents the number of lanes of each inlet flow direction of the intersection, and S i represents the saturation flow rate of each inlet flow direction of the intersection;
Substituting the traffic flow design data of each inlet flow direction of the intersection after adjustment, the lane number of each inlet flow direction and the saturation flow rate into a formula (1) to obtain the ratio of the traffic flow rates of each inlet flow direction of the intersection:
q ' nl、q′nt is traffic flow design data after the adjustment of the left and right directions of the north import, q s′l、qs′t is traffic flow design data after the adjustment of the left and right directions of the south import, q ' wl、q′wt is traffic flow design data after the adjustment of the left and right directions of the west import, q ' el、q′et is traffic flow design data after the adjustment of the left and right directions of the east import, the number of lanes of the left and right directions of the north import of the intersection is N nl、Nn, the number of lanes of the left and right directions of the south import is N sl、Nst, the number of lanes of the left and right directions of the west import is N wl、Nwt, and the number of lanes of the left and right directions of the east import is N el、Net;
Calculating a cycle flow rate ratio:
Y＝∑yi＝max(y1,y2)+max(y3,y4)+max(y5,y6)+max(y7,y8) (2)
wherein Y represents an intersection total period flow rate ratio.
The specific steps for calculating the saturation of each flow direction are as follows:
(1) Calculating the total loss time
For simple calculation, the phase yellow light time A takes 3 seconds, the full red light time r takes 0 seconds, the green light interval time I is 3 seconds, and the starting loss time l takes 3 seconds;
The period total loss time L adopts the formula:
(2) Determining a period duration C:
(3) The total effective green time G E is calculated:
GE＝∑gei=C-L (5)
(4) Calculating the effective green time g ei of each phase:
(5) Minimum green time g min is calculated:
Wherein g min is the shortest green light time, the dimension is s, L P is the length of a pedestrian crossing street, the dimension is m, V P is the walking speed of the pedestrian crossing street, V P is defined as 1.2m/s, I is the green light interval time, and the dimension is s;
In order to enable the signal timing scheme to meet the traffic demands of vehicles and pedestrians at intersections, the effective green time g ei of each phase is required to be greater than or equal to the minimum green time g mini of each phase, the processing method is that g ei is multiplied by an adjustment coefficient f, when g ei≥gmini, f takes a value of 1, when g ei＜gmini, f takes a value of the maximum ratio of g mini to g ei, namely max (g jmin/gej), and the adjusted effective green time is obtained Further determining an adjusted cycle duration C';
(6) Calculating the green time g i of each phase display:
(7) Calculating the saturation x i of each flow direction;
Where lambda i is the green-to-signal ratio for each flow direction.
After the preliminary construction road section surrounding road junction traffic flow guiding and untangling scheme is obtained, one day is implemented at the construction road section surrounding road junction, the saturation of each inlet flow direction of the surrounding road junction needing to be shunted is calculated according to the data of the day in time intervals, if the saturation is smaller than the threshold value, the scheme is continuously implemented the next day, if the saturation is not in accordance with the requirement, the construction road section surrounding road junction traffic flow guiding and untangling scheme is updated and adjusted according to the method according to the data of the day, and so on until the scheme is suitable for a period of time, a set of surrounding road junction traffic flow guiding and untangling scheme meeting the construction road section passing flow shunting can be determined, and the construction road section surrounding road junction traffic flow reaches balance.
Compared with the prior art, the invention has the beneficial effects that:
On one hand, a gradual adaptation process is reserved for drivers, on the other hand, the implemented scheme is tracked, evaluated and adjusted in time, and finally, a set of road traffic organization implementation schemes which are adapted to the drivers and meet road network traffic release conditions and different time period traffic flow change requirements are determined under the road totally-enclosed construction conditions, so that the applicability of traffic diversion of the road surrounding the road totally-enclosed construction is improved, and the occurrence of large-area traffic jam is effectively avoided.
1. According to the invention, the traffic flow of the construction road section to the upstream road section and the downstream road section is gradually reduced by adjusting the traffic signal timing and the direction of the entrance lane before the road totally-enclosed construction, so that the purpose of gradually reducing the traffic flow of the construction road section is achieved, a peripheral road section traffic organization step-by-step adjusting method for gradually reducing the traffic flow of the construction road is established, and finally, a set of construction road section peripheral road section traffic flow guiding and untwining scheme meeting 100% traffic flow diversion of the construction road section is determined.
2. The invention tracks, evaluates and adjusts the preliminary road section surrounding road junction traffic flow guiding and untwining scheme for a period of time, and finally determines a set of road traffic organization implementation scheme of the road section surrounding road junction under the road totally-enclosed construction condition which meets the road network traffic release condition and different time period traffic flow change requirements and is suitable for drivers, so as to improve the applicability of the surrounding road junction traffic diversion after the road totally-enclosed construction.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
FIG. 2 is a diagram showing a data structure of a truck passing through a truck.
FIG. 3 is a schematic view of the road junction around the construction section of the present invention.
FIG. 4 is a timing scheme check flow chart of the present invention.
Fig. 5 is a schematic view of a temporary mobile variable steering lane indicator screen according to the present invention.
FIG. 6 is a schematic view of an intersection for which diversion is required after the traffic flow of a construction road section is gradually reduced.
Fig. 7 is a phase diagram corresponding to the intersection 1 after the construction road section reduces the traffic flow by 100%.
Fig. 8 is a schematic diagram of an embodiment of the traffic organization engineering of the road junction around the construction road section.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
As shown in fig. 1-8, a road totally-enclosed construction-oriented traffic organization gradual transition adjustment method comprises the following steps:
1. Constructing an information data resource base oriented to intersections around a totally-enclosed construction road
And acquiring the blocking and driving data, the crossing signal control scheme data and the crossing canalization data of the crossing around the construction road section for approximately one month.
(1) The method comprises the steps of constructing the traffic data of the intersection, wherein the traffic data of the intersection is generally arranged at the position, close to a stop line, of an entrance lane in each direction of the intersection, and is 10-30 m away from the stop line, so that vehicles of illegal behaviors of the intersection are monitored, photographed and evidence obtained on one hand, and each vehicle passing through the intersection is recorded in real time on the other hand. The data structure of the passing vehicle at the bayonet, which is obtained by using the bayonet equipment, is shown in fig. 2, and mainly comprises a passing vehicle id, an intersection number, an entrance way direction, a flow direction, a lane number, a license plate number, a vehicle type and a passing time.
(2) The signal control scheme data is acquired, wherein the intersection signal control scheme data is mainly acquired by a signal control platform and comprises intersection time period dividing data, phase scheme design data and intersection signal timing data.
(3) And constructing intersection channelized data, wherein the intersection channelized data is obtained by means of an electronic map, manual on-site investigation and the like.
(4) By cleaning, matching and calculating the data:
① Acquiring the traffic data of each inlet flow direction of the construction road section surrounding road junction in one month at different time periods;
② Calculating the maximum 15min traffic flow data of each inlet flow direction of each intersection at the periphery of the construction road section in one month, and adding and averaging to obtain the maximum 15min traffic flow data of each inlet flow direction of each day at each time interval:
wherein, Representing the sum of the maximum 15min traffic data for one month with one entry flowing to one period.
③ Determining the design data of the average one-hour traffic flow of different inlet flow directions of a construction road section surrounding road on average in one day and in time intervals:
2. Establishing a gradual adjustment method for traffic organizations of surrounding intersections with gradually reduced traffic flow of construction roads
The traffic flow of the construction road section in all directions of the road junction at the upper and the lower sides of the construction road section is gradually reduced by adjusting the traffic signal timing and the direction of the entrance lane before the road is totally enclosed, so as to achieve the purpose of gradually reducing the traffic flow of the construction road section. The process of gradually reducing the traffic flow of the construction section is to consider that the driver can adapt gradually and cannot influence the construction progress, so that the gradually reducing traffic flow of the construction section is not suitable to be too large or too small, and the gradually reducing traffic flow of the construction section can be set to be 20%.
As shown in fig. 3, assuming that the intersections 1 and 2 are respectively an upstream intersection and a downstream intersection of a construction road section, taking an example of an intersection 1 for a period of time, obtaining traffic flow design data of each of left, right and left directions of a north entrance of the intersection 1 as q nl、qnt、qnr, the number of lanes as N nl、Nnt、Nnr, traffic flow design data of each of left, right and left directions of a south entrance as q sl、qst、qsr, the number of lanes as N sl、Nst、Nsr, traffic flow design data of each of left, right and left directions of a west entrance as q wl、qwt、qwr, the number of lanes as N wl、Nwt、Nwr, traffic flow design data of each of left, right and left directions of an east entrance as q el、qet、qer, and the number of lanes as N el、Net、Ner. The flow directions of the construction road sections which are converged by the intersection 1 are north left turn, east straight run and south right turn respectively, and the corresponding traffic flow design data are q nl、qet and q sr respectively, so that the traffic flow design data of the construction road sections converged by the intersection 1 in the period are as follows:
Q=qnl+qet+qsr
Firstly, the traffic flow of a construction road section is reduced by 20%, which is equivalent to the reduction of traffic flow design data of the construction road section by 20%, and accordingly, the traffic flow design data of different inlets of an upstream road section and a downstream road section, which flow to the construction road section, are respectively reduced by 20%, for example, the traffic flow design data of the construction road section which is converged by the north left turn, the east straight run and the south right turn of the road section 1 are respectively reduced by 20%, the traffic flow design data of different inlets of the road section 2 which is converged by the construction road section are also reduced by 20%, and because the east inlet of the road section 1 is the traffic flow output direction of the road section which is converged by the road section 2, the traffic flow design data of each flow direction of the east inlet of the road section 1 is reduced by 20%. In order to balance traffic volumes of all inlet flow directions of the intersection 1, traffic flow reduced by the flow directions of the construction road sections is required to be redistributed to other flow directions, and after the traffic flow design data of all inlet flow directions of the intersection 1 are set, the left, right and right of a north inlet are respectively q 'nl、q′nt、q′nr, the left, right and right of a south inlet are respectively q s′l、qs′t、qs′r, the left, right and right of an east inlet are respectively q e′l、qe′t、qe′r, and the left, right and right of a west inlet are respectively q' wl、q′wt、q′wr. The flow direction and traffic flow design data relationships after and before adjustment are shown in table 1.
TABLE 1 flow design data relationship table for each flow direction after and before adjustment
After each entry traffic flow design data is determined, taking the current four-phase scheme as an example, re-optimizing the timing scheme and executing a timing scheme checking flow, as shown in fig. 4, the timing scheme checking flow is as follows:
(1) Determining a vehicle flow rate ratio:
Where y i represents the ratio of the flow rates of the traffic flow in each inlet flow direction of the intersection, q i represents the traffic flow design data of each inlet flow direction of the intersection, N i represents the number of lanes of each inlet flow direction of the intersection, and S i represents the saturation flow rate of each inlet flow direction of the intersection.
Substituting the traffic flow design data after the adjustment of each inlet flow direction of the intersection 1, the lane number and the saturation flow rate of each inlet flow direction into a formula 1 to obtain the ratio of the traffic flow rates of each inlet flow direction of the intersection 1:
Calculating a cycle flow rate ratio:
Y＝∑yi＝max(y1,y2)+max(y3,y4)+max(y5,y6)+max(y7,y8) (2)
wherein Y represents an intersection total period flow rate ratio.
(2) Judging the sizes of Y and 0.9
① If Y is less than 0.9, performing the next calculation;
② If Y is more than or equal to 0.9, that is, the Y value does not meet the requirement, the flow direction corresponding to the maximum value of the flow rate ratio of the vehicle flow is found, and measures are taken to reduce the flow rate ratio of the vehicle flow in the flow direction.
In order not to change the original traffic habits of the driver and generally not to change the existing phase scheme, the inlet lane allocation scheme can be optimized to reduce the flow rate ratio Y of the corresponding flow direction traffic flow, so that the value Y is reduced, and the optimized inlet lane allocation scheme must meet the requirement that at least 1 flow direction lane number is required. When all the inlet lane combination schemes are traversed and Y is more than or equal to 0.9 is calculated through the formulas (1) and (2), the upstream intersection corresponding to the flow direction (such as the upstream intersection 8 corresponding to the intersection 1) corresponding to the intersection with the maximum ratio of the traffic flow rate is required to be found for limiting, in order to ensure the continuity of traffic flow change, 10% of traffic flow of the upstream intersection entering the intersection can be reduced each time, the traffic flow design data corresponding to the inlet flow direction of the intersection is reduced by 10% after each reduction, and the Y value is recalculated according to the formulas (1) and (2) according to the adjusted traffic flow design data until Y <0.9 of the intersection is calculated. When the upstream intersection is reduced once and the traffic flow of 10% of the entrance is converged, the upstream intersection also needs to re-optimize the lane or limit the flow of the upstream intersection (such as the upstream intersection 9 corresponding to the intersection 8) according to the method until Y <0.9 of the upstream intersection is calculated, and the like, until the Y value of the surrounding intersections which need to be shunted after the traffic flow of 20% of the construction road section is reduced is calculated is less than 0.9, and the next calculation can be performed.
(3) Calculating the total loss time
For simple calculation, the phase yellow light time A takes 3 seconds, the full red light time r takes 0 seconds, the green light interval time I is 3 seconds, and the starting loss time l takes 3 seconds.
The total loss time of the period adopts the formula:
(4) Determining period duration:
(5) The total effective green time G E is calculated:
GE＝∑gei=C-L (5)
(6) Calculating effective green time of each phase:
(7) Minimum green time g min is calculated:
Wherein g min is the shortest green lamp time, s;
L P is the length of a pedestrian crossing road, m;
V P is the walking speed of the pedestrian crossing the street, 1.2m/s;
i is green light interval time, s.
In order to enable the signal timing scheme to meet the traffic demands of vehicles and pedestrians at intersections, the effective green time g ei of each phase needs to be greater than or equal to the minimum green time g mini of each phase, the processing method is that g ei is multiplied by an adjustment coefficient f (f takes a value of 1 when g ei≥gmini, and f takes a value of the maximum ratio of g mini to g ei when g ei＜gmini, namely max (g jmin/gej)), so as to obtain the adjusted effective green time lengthThe adjusted cycle length C' is further determined.
(8) Calculating green time of each phase display:
(9) Calculating the saturation x i of each flow direction;
Where lambda i is the green-to-signal ratio for each flow direction.
If it is calculated that one of the inlet flow directions of the intersection is in a supersaturated state, that is, the saturation is greater than 0.95, the inlet flow direction of the intersection will generate a phenomenon of congestion and paralysis. In order not to change the original traffic habits of the driver, the existing phase scheme is not changed generally, the corresponding flow direction saturation is reduced by adjusting the inlet lane allocation scheme and signal timing, and the optimized inlet lane allocation scheme must meet the requirement that at least 1 flow direction lane number is required. When the flow direction saturation is calculated to be greater than 0.95 through the formulas (1) to (9) by traversing all the inlet lane combination schemes, the upstream intersection corresponding to the flow direction (such as the upstream intersection 8 corresponding to the intersection 1) needs to be found for current limiting, 10% of the traffic flow of the upstream intersection entering the intersection can be reduced each time in order to ensure the continuity of traffic flow change, the traffic flow design data of the inlet flow direction corresponding to the intersection is reduced by 10% after each reduction, and the saturation is calculated according to the formulas (1) to (9) by the adjusted traffic flow design data until the saturation of the flow direction is calculated to be less than 0.95. When the traffic flow of the upstream intersection which is converged into the inlet 10% is reduced once, the upstream intersection also needs to be limited by the above method when the upstream intersection is re-optimized, the traffic lane is or the upstream intersection (such as the upstream intersection 9 corresponding to the intersection 8) is limited until the saturation of each inlet flow direction of the upstream intersection is calculated to be less than 0.95, and so on, until the saturation of each inlet flow direction of the peripheral intersection which needs to be shunted after the traffic flow of the construction road is reduced by 20% is calculated to be less than 0.95, stopping iterative calculation, and obtaining the preliminary construction road periphery intersection traffic flow guiding and untangling scheme.
And after the preliminary construction section peripheral intersection traffic flow guiding and untangling scheme is obtained, one day is implemented at the construction section peripheral intersection, the saturation of each inlet flow direction of the peripheral intersection needing to be shunted is calculated according to the data of the day in time intervals, if the saturation is smaller than 0.95, the scheme is continuously implemented the next day, if the saturation is not satisfied, the construction section peripheral intersection traffic flow guiding and untangling scheme is updated and adjusted according to the method according to the data of the day, and the like until the scheme is suitable for one week, so that a set of peripheral intersection traffic flow guiding and untangling scheme meeting 20% traffic flow shunting of the construction section can be determined, the traffic flow of the construction section peripheral intersection reaches balance, and a temporary movable variable diversion lane indication screen is placed at the upstream section of all the intersections needing to be shunted to guide the vehicle to shunt in time. As shown in fig. 5, the temporary mobile variable steering lane indication screen is divided into two parts, namely an LED variable lane indication device and a traffic guiding screen, the LED variable lane indication device reserves a left-turn lane and a right-turn lane, an embedded LED display device is arranged in the middle lane to support switching of 3 states of straight-going, left-turn and right-turn so as to realize the switching of the traffic direction of the crossing lane, and the traffic guiding screen displays the requirement for road construction in front and instructs to drive according to the lane. The solar power supply panel is arranged at the top of the temporary movable variable steering lane indication screen, solar energy is used for supplying power to the temporary movable variable steering lane indication screen, the bottom of the temporary movable variable steering lane indication screen is of a cuboid structure, and universal wheels are respectively arranged at four corners of the bottom of the temporary movable variable steering lane indication screen, so that the temporary movable variable steering lane indication screen can be conveniently moved and can be stably used. The temporary movable variable diversion lane indication screen is placed in front of an original diversion lane indication board of an upstream road section of a crossing needing diversion, the original diversion lane indication board is covered by a blue film, and a guiding arrow mark corresponding to an inlet lane needing diversion is erased.
Similarly, the traffic flow of the construction road sections is reduced by 40%, 60%, 80% and 100% step by step, and when the traffic flow of the construction road sections is reduced once, the corresponding intersections needing diversion and fluffing are increased. For example, in fig. 6, the intersection included in the purple line segment represents the intersection required to be shunted after the construction road segment is reduced by 20% of traffic flow, the intersection included in the purple line segment and the green line segment represents the intersection required to be shunted after the construction road segment is reduced by 40% of traffic flow, the intersection included in the purple line segment, the green line segment and the blue line segment represents the intersection required to be shunted after the construction road segment is reduced by 60% of traffic flow, the intersection included in the purple line segment, the green line segment, the blue line segment and the yellow line segment represents the intersection required to be shunted after the construction road segment is reduced by 80% of traffic flow, and the intersection included in the purple line segment, the green line segment, the blue line segment, the yellow line segment and the red line segment represents the intersection required to be shunted after the construction road segment is reduced by 100% of traffic flow. According to the method, the corresponding peripheral intersection traffic flow guiding and untwining schemes after the passing flow of the construction road section is reduced step by step are respectively determined, and finally, a set of peripheral intersection traffic flow guiding and untwining scheme meeting 100% passing flow diversion of the construction road section is determined. When the traffic flow of the construction road section is reduced by 100%, the traffic flow and the number of lanes of each inlet flow direction of the construction road section upper and downstream road junctions to the construction road section are both 0, and at the moment, the construction road section upper and downstream road junctions are T-shaped road junctions, and the phase scheme can be set according to the T-shaped road junction signal phase scheme. For example, as shown in fig. 3, taking the upstream intersection 1 of the construction road section as an example, when the construction road section reduces the traffic flow by 100%, the construction road section is totally closed, the east opening of the corresponding intersection 1 is closed, and the phase diagrams thereof are respectively three phases of west left turn, north-south straight run and south left turn as shown in fig. 7, wherein the traffic right turn direction may not be controlled.
3. Determining construction section surrounding crossing traffic tissue engineering implementation scheme under road totally-enclosed construction condition
And determining the implementation scheme of the traffic organization engineering of the surrounding road junction for the totally-enclosed construction of the road based on a set of traffic flow guiding and untwining scheme of the surrounding road junction meeting the 100% traffic flow diversion of the construction road section. When corresponding entrance lane guiding arrow marks, lane dividing sign indicating directions and signals are adjusted at the intersections around the construction road section needing to be implemented by traffic organization, a sign for prohibiting a certain flow direction from running is further arranged at the entrance of the upper and the lower road sections of the construction road section, and auxiliary signs for dividing information of the construction road section are attached to the bars of the original lane dividing sign at the entrance of the upper and the lower road sections of the construction road section. As shown in fig. 8, in addition to optimizing signal timing, it is necessary to adjust the respective entrance lane guide arrow mark and direction-dividing lane sign indication direction at the construction section peripheral intersections 3,4, 5, 6, 7, 8, and it is necessary to adjust the respective entrance lane guide arrow mark and direction-dividing lane sign indication direction at the construction section upstream and downstream intersections 1,2, and install a traffic sign prohibiting a certain flow direction and a construction section diversion information auxiliary sign. Taking the south entrance of the construction road section upstream intersection 1 as an example, an entrance lane marking in the direction of the south entrance and an indication direction of the branch lane marking are uniformly adjusted into two straight lines and one left turn, and the road section diversion information auxiliary indication board displays that the front right turn is the construction road section and the road is driven by detouring. After the engineering implementation scheme is finished, the construction road can be subjected to full-closed construction.
The foregoing description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (5)
1. The step-by-step transition adjustment method for the traffic organization for the road totally-enclosed construction is characterized by comprising the following steps of:
(1) Acquiring the data of the passing of vehicles at the entrance of the road around the construction road section, the data of the signal control scheme of the road junction and the data of the canal formation of the road junction, and cleaning, matching and calculating the data to obtain the design data of the one-hour traffic flow of the road around the construction road section, wherein the design data of the traffic flow of the road junction is different in average one-day different inlet flow directions and time intervals;
(2) The traffic flow of the construction road section to the construction road section in all directions of the road junction at the upper and the lower sides is gradually reduced by adjusting the traffic signal timing and the direction of the entrance lane before the road totally-enclosed construction, so as to achieve the purpose of gradually reducing the traffic flow of the construction road section, and the method comprises the following specific steps:
2.1 Determining the traffic flow reduction proportion of the construction road section, reducing traffic flow design data of the construction road section which is collected into each flow direction of different inlets of an upstream intersection and a downstream intersection of the construction road section according to the set proportion, and redistributing the traffic flow reduced by the flow direction of the construction road section to other flow directions to obtain the traffic flow design data of each flow direction after adjustment;
2.2 Calculating the adjusted total cycle flow rate ratio Y of the intersection, and judging whether the adjusted total cycle flow rate of the intersection is smaller than a threshold value or not;
① If the adjusted total period flow rate of the intersection is smaller than the threshold value, the next step can be carried out;
② If the inlet lane allocation scheme is optimized, the total cycle flow rate of the intersection after adjustment cannot be made smaller than the threshold value, the upstream intersection corresponding to the flow direction corresponding to the maximum value of the ratio of the traffic flow rate of the intersection needs to be found to limit the flow until the total cycle flow rate of the intersection after adjustment is smaller than the threshold value;
2.3 Calculating the saturation of each flow direction, and judging whether each flow direction is in a saturated state or not according to the saturation of each flow direction
① If all the flow directions are not in a saturated state, a preliminary construction road section surrounding intersection traffic flow guiding and untwining scheme is obtained;
② If the inlet lane distribution scheme and the signal timing are not adjusted so that the inlet flow direction can not meet the conditions, the upstream intersection corresponding to the flow direction needs to be found for limiting the flow, and the upstream intersection also needs to be re-optimized according to the method for timing, lane or limiting the flow of the upstream intersection until the saturation of each inlet flow direction of the upstream intersection is calculated to be smaller than a threshold value;
2.4 After the preliminary construction road section surrounding intersection traffic flow guiding and untwining scheme is realized for a period of time, the traffic flow of the construction road section is gradually reduced according to the steps until the traffic flow of the construction road section is reduced by 100%, and the construction road section is totally closed;
the step of calculating the adjusted total cycle flow rate ratio Y of the intersection is as follows:
(1) Determining a vehicle flow rate ratio:
Wherein y i represents the ratio of the flow rates of the traffic flow of each inlet flow direction of the intersection, q i represents the traffic flow design data of each inlet flow direction of the intersection, N i represents the number of lanes of each inlet flow direction of the intersection, and S i represents the saturation flow rate of each inlet flow direction of the intersection;
Substituting the traffic flow design data of each inlet flow direction of the intersection after adjustment, the lane number of each inlet flow direction and the saturation flow rate into a formula (1) to obtain the ratio of the traffic flow rates of each inlet flow direction of the intersection:
q ' nl、q′nt is traffic flow design data after the adjustment of the left and right directions of the north import, q s′l、qs′t is traffic flow design data after the adjustment of the left and right directions of the south import, q ' wl、q′wt is traffic flow design data after the adjustment of the left and right directions of the west import, q ' el、q′et is traffic flow design data after the adjustment of the left and right directions of the east import, the number of lanes of the left and right directions of the north import of the intersection is N nl、Nn, the number of lanes of the left and right directions of the south import is N sl、Nst, the number of lanes of the left and right directions of the west import is N wl、Nwt, and the number of lanes of the left and right directions of the east import is N el、Net;
Calculating a cycle flow rate ratio:
Y＝∑yi＝max(y1,y2)+max(y3,y4)+max(y5,y6)+max(y7,y8) (2)
wherein Y represents an intersection total period flow rate ratio;
the specific steps for calculating the saturation of each flow direction are as follows:
(1) Calculating the total loss time
For simple calculation, the phase yellow light time A takes 3 seconds, the full red light time r takes 0 seconds, the green light interval time I is 3 seconds, and the starting loss time l takes 3 seconds;
The period total loss time L adopts the formula:
(2) Determining a period duration C:
(3) The total effective green time G E is calculated:
GE＝∑gei=C-L (5)
(4) Calculating the effective green time g ei of each phase:
(5) Minimum green time g min is calculated:
Wherein g min is the shortest green light time, the dimension is s, L P is the length of a pedestrian crossing street, the dimension is m, V P is the walking speed of the pedestrian crossing street, V P is defined as 1.2m/s, I is the green light interval time, and the dimension is s;
In order to enable the signal timing scheme to meet the traffic demands of vehicles and pedestrians at intersections, the effective green time g ei of each phase is required to be greater than or equal to the minimum green time g mini of each phase, the processing method is that g ei is multiplied by an adjustment coefficient f, when g ei≥gmini, f takes a value of 1, when g ei＜gmini, f takes a value of the maximum ratio of g mini to g ei, namely max (g jmin/gej), and the adjusted effective green time is obtained Further determining an adjusted cycle duration C';
(6) Calculating the green time g i of each phase display:
(7) Calculating the saturation x i of each flow direction;
Where lambda i is the green-to-signal ratio for each flow direction.
2. The method for adjusting the gradual transition of traffic organizations for road totally enclosed construction according to claim 1, wherein the traffic data of the gate includes passing id, crossing number, entrance direction, flow direction, lane number, license plate number, vehicle type, and passing time;
the intersection signal control scheme data comprise intersection time period division data, phase scheme design data and intersection signal timing data.
3. The stepwise transition adjustment method for traffic organizations for road totally enclosed construction according to claim 1, wherein the step of obtaining the one-hour traffic flow design data of different inlet flow directions of the construction section periphery crossing on average for one day in time intervals in the step (1) is as follows:
① Acquiring the traffic data of each inlet flow direction of the construction road section surrounding road junction in one month at different time periods;
② Calculating the maximum 15min traffic flow data of each inlet flow direction of each intersection at the periphery of the construction road section in one month, and adding and averaging to obtain the maximum 15min traffic flow data of each inlet flow direction of each day at each time interval:
wherein, A sum of maximum 15min traffic flow data representing one of the ingress flows for one period of time within one month;
③ Determining the design data of the average one-hour traffic flow of different inlet flow directions of a construction road section surrounding road on average in one day and in time intervals:
4. the stepwise transition adjustment method for traffic organizations for road totally enclosed construction according to claim 1, wherein the step of redistributing the traffic flow reduced in the flow direction to the construction section to other flow directions is as follows:
North import left turn q' nl＝(1-α)qnl;
The north import goes straight:
North import right turn:
south import left turn:
the south import goes straight:
south import right turn: q' sr＝(1-α)qsr;
left turn of west import:
The Western import goes straight, q' wt＝(1-α)qwt;
west import right turn:
Left turn at east entrance q' el＝(1-α)qel;
the east entrance goes straight q' es＝(1-α)qes;
right turn east entrance q' er＝(1-α)qer;
Q nl、qnt、qnr is traffic flow design data of left, right and left directions of the north entrance of the intersection, q sl、qst、qs is traffic flow design data of left, right and left directions of the south entrance, q wl、qwt、qwr is traffic flow design data of left, right and left directions of the west entrance, and q el、qet、qer is traffic flow design data of left, right and left directions of the east entrance; the method comprises the steps of setting a flow rate reduction ratio of a construction road section, setting q 'nl、q′nt、q′nr as flow rate design data of the north inlet after left, right and left flow directions are adjusted, setting q' sl、q′st、q′sr as flow rate design data of the south inlet after left, right and left flow directions are adjusted, setting q 'wl、q′wt、q′wr as flow rate design data of the west inlet after left, right and left flow directions are adjusted, and setting q' el、q′et、q′er as flow rate design data of the east inlet after left, right and left flow directions are adjusted.
5. The method for gradually transitional adjustment of traffic organization for road totally enclosed construction according to claim 1, characterized in that after the preliminary construction road section surrounding intersection traffic flow guiding and untangling scheme is obtained, one day is implemented at the construction road section surrounding intersection, the inlet flow direction saturation of the surrounding intersection to be shunted is calculated according to the data time division period of the day, if the saturation is smaller than the threshold value, the scheme is implemented continuously the next day, if the saturation is not satisfactory, the construction road section surrounding intersection traffic flow guiding and untangling scheme is updated and adjusted according to the method according to the data of the day, and so on until the scheme is suitable for a period of time, a set of surrounding intersection traffic flow guiding and untangling scheme meeting the construction road section passing flow shunting can be determined, so that the construction road section surrounding intersection traffic flow reaches balance.
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