CN114613156B - Full-induction type independent signal control method for cross-shaped reverse left-turn intersection - Google Patents
Full-induction type independent signal control method for cross-shaped reverse left-turn intersection Download PDFInfo
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- G—PHYSICS
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Abstract
The invention provides a full induction type independent signal control technology for a cross reverse left-turn intersection, and belongs to the technical field of traffic signal control. The invention provides the necessary technical conditions of the reverse left-turn intersection in the aspects of road space layout and traffic control facilities. And installing the motor vehicle detectors on an entrance lane and a reverse left-turn lane. The effect of reversing left turn lanes is interpreted as: during the red light of the left turn vehicle phase, queuing space is provided for left turn vehicles that are ready to enter the intersection. And (3) formulating a design principle of a phase display sequence according to the position of the reverse left-turn lane, and establishing a synchronous relation between the entrance phase of the reverse left-turn lane and the phase of the motor vehicle. And designing a green light sensing logic for the motor vehicle phase, and designing a green light sensing logic and a red light sensing logic for the reverse left-turn lane entrance phase. By adopting the technical scheme, the safety risk of the reverse left-turn lane is reduced, the service capacity of the reverse left-turn lane is exerted, and the overall performance of the reverse left-turn intersection is improved.
Description
Technical Field
The invention belongs to the technical field of traffic signal control, and relates to a full-induction type independent signal control method for a cross-shaped reverse left-turn intersection.
Background
The reverse left-turn lane is a lane on an exit road of the signalized intersection, which permits a left-turn vehicle ready to enter the intersection to use within a certain time. The reverse left-turn intersection is a signal control intersection provided with a reverse left-turn lane on one or more exit roads.
According to the traffic running process of the signalized intersection, the exit road is often in a relatively idle state when not serving straight-ahead vehicles at the upstream entrance and left-turning vehicles at the intersection. People use the characteristics to set the traffic lanes at the inner sides of the exit roads into reverse left-turn lanes, and allow left-turn vehicles ready to enter the intersection to drive into the reverse left-turn lanes to wait in a queue when the exit roads are relatively idle, and after the left-turn direction indicating signal lamp lights the green light, the vehicles in the reverse left-turn lanes and the left-turn entrance lanes pass through the intersection together. The reverse left-turn lane improves the utilization degree of the stock exit road, increases the service capacity of left-turn vehicles, creates conditions for reducing traffic load at the intersection, but if left-turn vehicles in the reverse left-turn lane are not emptied in time or enter the reverse left-turn lane illegally, traffic accidents are possibly caused.
The independent signal control refers to a technology for independently controlling a traffic signal lamp of one intersection without considering the time distance relation of adjacent intersections. The full induction type independent signal control is a form of independent signal control, and is mainly characterized in that: the method comprises the steps of installing motor vehicle detectors on all entrance lanes of an intersection, designing green light induction logic for motor vehicle phases, and automatically adjusting green light duration of the motor vehicle phases within a certain range according to real-time sensed motor vehicle traffic demands. Compared with other forms of independent signal control, the full-induction type independent signal control does not need to predict the traffic requirement of the motor vehicle, does not depend on the green light time of the phase position of the motor vehicle generated by an optimization model, has the advantages of simple working principle, low calculation overhead, high response speed and the like, and can be implemented in a plurality of signal control intersections in a city in whole day or in partial time of one day.
The reverse left-turn intersection changes the conventional road space layout, uses some new traffic control facilities, puts forward some new requirements on the traffic operation process, and the traditional full-induction independent signal control technology cannot be directly applied to the reverse left-turn intersection. Therefore, it is necessary to develop a new full-induction independent signal control technology for the reverse left-turn intersection.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a full induction type independent signal control method for a cross reverse left-turn intersection.
The technical scheme adopted by the invention is as follows:
the invention discloses a full-induction type independent signal control method for a cross reverse left-turn intersection, and provides technical conditions of the reverse left-turn intersection which are necessary in the aspects of road space layout and traffic control facilities. And (4) installing the motor vehicle detectors on an entrance lane and a reverse left-turn lane. The effect of reversing left turn lanes is interpreted as: during the red light of the left turn vehicle phase, queuing space is provided for left turn vehicles that are ready to enter the intersection. And according to the position of the reverse left-turn lane, making a design principle of a phase display sequence, and establishing a synchronous relation between the entrance phase of the reverse left-turn lane and the phase of the motor vehicle. And designing a green light sensing logic for the motor vehicle phase, designing a green light sensing logic and a red light sensing logic for the reverse left-turn lane entrance phase, and automatically adjusting the green light duration of the motor vehicle phase, the green light duration and the red light duration of the reverse left-turn lane entrance phase within a certain range.
The technical scheme of the invention is introduced from the aspects of symbolic description, road space layout, road traffic lights, road traffic signs, road traffic markings, motor vehicle detection, phase display sequence, intersection signal control logic, green light sensing logic of motor vehicle phases, green light sensing logic of reverse left-turn lane entry phases, red light sensing logic of reverse left-turn lane entry phases and the like. The method comprises the following specific steps:
1. description of the symbols
Cm is numbered in the reverse left-turn lane entry phase;
g Cm the green time of the phase Cm;
g Vi the green duration of phase Vi;
gap Vi,l the air-current time collected by the I-th entrance lane detector of the phase Vi;
GAP Vi the idle time threshold of the phase Vi;
pj pedestrian phase number;
L Vi the total number of entrant lanes for phase Vi;
maxG Vi the maximum green duration of phase Vi;
minG Cm the minimum green duration of phase Cm;
minG Vi the minimum green duration of phase Vi;
vi motor vehicle phase number;
V Vi in the phase display sequence, the motor vehicle phase number of the green light is permitted to be displayed simultaneously with the phase Vi;
2. Spatial layout of road
The intersection to be provided with the reverse left-turn lane is provided with 4 branches, each branch permits the motor vehicle to pass in two directions, and a left-turn entrance lane, a straight-going entrance lane and a straight right entrance lane are arranged.
Setting up intersection branches of reverse left-turn lanes, wherein the length of a left-turn entrance lane is not less than 40m, and the total number of lanes of an exit road is not less than 3; if the motor vehicle with the vehicle length less than 6m turns left through the intersection by using the innermost exit lane, the turning radius is not less than 20m.
Setting an intersection branch of a reverse left-turn lane, wherein the sum of the number of reverse left-turn lanes and the number of left-turn entrance lanes is less than the total number of lanes of an exit road into which left-turn vehicles enter after passing through the intersection; if the center of the road has no solid separation zone, arranging a solid isolation fence on the boundary line of the opposite roadway which is forbidden to cross; opening a reverse left-turn lane entrance at the starting point of the innermost left-turn entrance lane; opening a reversing opening of the motor vehicle at the upstream 10-30 m of the entrance of the reverse left-turn lane.
When the length of the pedestrian crossing exceeds 16m, a pedestrian crossing safety island is arranged in the center of the pedestrian crossing, and the width of the pedestrian crossing safety island is not less than 2m.
3. Road traffic signal lamp
And (3) installing a motor vehicle signal lamp, a left-turning direction indicating signal lamp and a pedestrian signal lamp according to the regulations of the existing national standard road traffic signal lamp setting and installing standard. A special form of lane signal light is installed at the entrance of the reverse left turn lane using a pattern comprising a red cross, green arrow pointing to the lower left, yellow arrow pointing to the lower left.
The sequence of the color change of the motor vehicle signal light, the left turn direction indicating signal light and the lane signal light is red → green → yellow → red. The pedestrian signal lamp has the sequence of light color conversion red → green flash → red.
And the vehicles in the straight-going inlet lane and the straight-right inlet lane pass through the intersection according to the indication of the signal lamp of the motor vehicle. And the vehicles in the reverse left-turn lane and the left-turn entrance lane pass through the intersection according to the indication of the left-turn direction indication signal lamp. And the vehicles on the upstream of the entrance of the reverse left-turn lane enter the reverse left-turn lane according to the indication of the lane signal lamp. Pedestrians at the edge of the pedestrian crossing pass through the pedestrian crossing according to the indication of the pedestrian signal lamp.
The straight phase is the control unit of the motor vehicle signal lamp. The left turn phase is a control unit of the left turn direction indicating signal lamp. The pedestrian phase is a control unit of the pedestrian signal lamp. The reverse left turn lane entry phase is the control unit for the lane signal lights.
4. Road traffic sign
According to the regulations of the existing national standard road traffic signs and marking lines, a turning-around allowing sign and a notice sign are arranged on one side of the turning-around opening of the motor vehicle, which is far away from the intersection, and characters on the notice sign are forward reverse left-turn lanes. And a sign for forbidding large buses and trucks to enter and a variable information sign are arranged on one side of the reverse left-turn lane entrance close to the intersection.
When the lane signal lamp displays green light, the variable information mark displays green characters: permitting a left-turn vehicle to enter;
when the lane signal lamp displays yellow light, the variable information mark displays yellow characters: permitting a left-turning vehicle to enter;
when the lane signal lamp displays red light, the variable information mark displays red characters: the left-turn vehicle is prohibited from entering.
And setting other traffic signs according to the regulations of the road traffic signs and marking lines in the current national standard.
5. Road traffic marking
The color pavement is used in the reverse left-turn lane, and no guide arrow is arranged.
Referring to the regulations of the existing national standard road traffic signs and marking lines on speed reduction and stopping and passing lines, a white virtual solid line is arranged at the end point of a reverse left-turn lane, a white solid line is arranged on one side far away from an intersection, and a white dotted line is arranged on one side close to the intersection.
According to the regulations of the existing national standard road traffic signs and marking lines, a single yellow solid line is arranged on one side of the reverse left-turn lane close to the center of the road. And yellow virtual solid lines are arranged at the starting point of the reverse left-turn lane and on the side close to the edge of the exit road, vehicles entering the intersection by using the reverse left-turn lane are prohibited from crossing the line, and vehicles leaving the intersection by using the reverse left-turn lane are permitted to cross the line. And a net line is arranged at the entrance of the reverse left-turn lane of the innermost left-turn entrance lane.
And arranging other road traffic marking lines according to the regulations of the road traffic marks and marking lines of the current national standard.
6. Motor vehicle detection
A vehicle detector, called an entrance lane detector, is installed at each entrance lane of the vehicle phase to collect the air-time duration 30m upstream of the stop line. The idle time is the time when the front vehicle tail leaves the detector before the rear vehicle head reaches the detector on one lane. And the time duration starts to be counted from the moment when the front car tail leaves the detector, and the time is counted until the rear car head reaches the detector. If any part of the body is on the detector, the airtime length =0s.
The method is characterized in that a motor vehicle detector is arranged on a reverse left-turn lane, and the motor vehicle detector is called as a reverse left-turn lane detector and is used for collecting the number of vehicles and the queuing length of the vehicles in the reverse left-turn lane. When the speed of the vehicle is reduced from higher than 5km/h to 5km/h and below, the vehicle is considered to enter a queuing state; when the vehicle speed is increased from 5km/h or less to 10km/h or more, the vehicle is considered to be out of the queuing state.
7. Phase display sequence
The effect of reversing left turn lanes is interpreted as: during the red light of the left turn phase, queuing space is provided for left turn vehicles that are ready to enter the intersection. Accordingly, a design principle of a phase display sequence is established for the reverse left-turn intersection.
If the north exit is provided with a reverse left-turn lane, the phase display sequence of the north entrance left-turn phase front position and the east entrance straight phase rear position is adopted, wherein the north entrance left-turn phase is the downstream left-turn phase of the north entrance reverse left-turn lane entrance phase, and the east entrance straight phase is the synchronous phase of the north entrance reverse left-turn lane entrance phase.
If the east exit is provided with the reverse left-turn lane, the phase display sequence of the east entrance left-turn phase front position and the south entrance straight phase rear position is adopted, wherein the east entrance left-turn phase is the downstream left-turn phase of the east entrance reverse left-turn lane entrance phase, and the south entrance straight phase is the synchronous phase of the east entrance reverse left-turn lane entrance phase.
If the south exit is provided with a reverse left-turn lane, the phase display sequence of the south entrance left-turn phase front-mounted and the west entrance straight-going phase rear-mounted is adopted, wherein the south entrance left-turn phase is a downstream left-turn phase of the south entrance reverse left-turn lane entrance phase, and the west entrance straight-going phase is a synchronous phase of the south entrance reverse left-turn lane entrance phase.
If the west exit is provided with a reverse left-turn lane, the phase display sequence of the west entrance left-turn phase front position and the north entrance straight phase rear position is adopted, wherein the west entrance left-turn phase is the downstream left-turn phase of the west entrance reverse left-turn lane entrance phase, and the north entrance straight phase is the synchronous phase of the west entrance reverse left-turn lane entrance phase.
In principle, the reverse left-turn lane entry phase may turn on and off the green light simultaneously with its synchronous phase. Starting from the red light end time of the synchronous phase, if vehicles leave the intersection in the reverse left-turn lane, forbidding the entrance phase of the reverse left-turn lane to light a green light; and if the green light duration of the entrance phase of the reverse left-turn lane can not be ensured to reach the minimum green light duration, forbidding the entrance phase of the reverse left-turn lane to light the green light. After the green light is turned on at the entrance phase of the reverse left-turn lane, if the queuing length of the vehicles in the reverse left-turn lane is about to reach the entrance of the reverse left-turn lane, the green light at the entrance phase of the reverse left-turn lane should be cut off.
8. Intersection signal control logic
And the signal control machine runs the signal control logic of the intersection once per second, and determines the light color of the signal lamp of each phase in the next second according to the sequence of the motor vehicle phase → the pedestrian phase → the reverse left-turn lane entrance phase. In the control process, the yellow light time of the straight-going phase, the left-turning phase and the reverse left-turning lane entrance phase is 3s, and the green light interval time between different phases and the green light time of the pedestrian phase are fixed values.
When the phase Vi displays green light, if the green light sensing logic of the phase Vi generates a green light cut-off request, the phase Vi displays yellow light in the next second, and the execution of the phases Vi to Vi is started
And
and the green light interval time of each phase is long, otherwise, the phase Vi continues to display green light, and the green light sensing logic of the phase Vi is executed.
When the phase Vi displays yellow light, if the duration of the yellow light of the phase Vi is not finished, the phase Vi continues to display the yellow light, otherwise, the phase Vi displays red light in the next second.
When phase Vi shows red light, if
And (4) finishing the execution of the interval duration from all the phases to the phase Vi to the green light, displaying the green light in the next second by the phase Vi, and otherwise, continuously displaying the red light by the phase Vi.
When the phase Pj displays green light, if the green light duration of the phase Pj is not finished, the phase Pj continues to display green light, otherwise, the phase Pj displays green flash light in the next second, and the phase Pj is started to be executed till the phase Pj is started to display green flash light
The green interval duration of each phase.
When the phase Pj shows green flashing light, if the phase Pj is up to
The green light interval durations of all the phases are executed, the phase Pj displays red light in the next second, otherwise,phase Pj continues to display green flashing lights.
When the phase Pj shows a red light, if
And (4) finishing the duration of the green light interval from all the phases to the phase Pj, displaying green light in the next second by the phase Pj, and otherwise, continuously displaying red light by the phase Pj.
When the phase Cm displays green light, if the green light sensing logic of the phase Cm generates a green light cut-off request, the phase Cm displays yellow light in the next second, otherwise, the phase Cm continuously displays green light, and the green light sensing logic of the phase Cm is executed.
When the phase Cm displays yellow light, if the yellow light duration of the phase Cm is not completed, the phase Cm continues to display yellow light, otherwise, the phase Cm displays red light in the next second.
And when the phase Cm displays the red light, if the red light sensing logic of the phase Cm generates a red light cut-off request, the phase Cm displays the green light in the next second, otherwise, the phase Cm continuously displays the red light, and the red light sensing logic of the phase Cm is executed.
9. Green light sensing logic for motor vehicle phase
And setting a minimum green light time length, a maximum green light time length and an idle time length threshold value for the phase Vi. When the space-time duration acquired by one entrance lane detector is greater than the space-time duration threshold, the entrance lane is considered to have traffic flow discontinuity.
For a phase Vi with a reverse left-turn lane, a green light cut request is permitted to be generated when one of the following conditions is satisfied from when the green light duration reaches the minimum green light duration:
1. each entrance lane has traffic flow discontinuity, and meanwhile, no vehicle exists in the reverse left-turn lane;
2. the green time reaches a maximum green time.
For a phase Vi without a reverse left-turn lane, a green light cut request is permitted to be generated when one of the following conditions is satisfied from when the green light time reaches the minimum green light time:
1. each entrance lane has traffic flow discontinuity;
2. the green time reaches a maximum green time.
If a lead-phase relative to the importation is permitted to generate a green light cut-off request, immediately generating a green light cut-off request for the same; if all post-phases relative to the imports are permitted to generate green light cut requests, green light cut requests are immediately generated for them.
10. Green light sensing logic for reverse left turn lane entry phase
Setting a minimum green duration for the phase Cm, which has a value less than or equal to the phase
The minimum green light duration. In phase
And vehicle queuing length control points are arranged in the reverse left-turn lane.
Generating a green light cut-off request for the phase Cm when one of the following conditions is satisfied from when the green light duration of the phase Cm reaches the minimum green light duration:
1. phase position
The queuing length of the vehicles in the reverse left-turn lane reaches a control point;
2. phase position
The yellow light is displayed in the next second.
11. Red light sensing logic for reverse left turn lane entry phase
A red light cut-off request is generated for the phase Cm when one of the following conditions is satisfied:
1. phase position
Display green light in the next second, while phase
The reverse left-turn lane has no vehicle;
2. phase position
The green light time is less than or equal to the phase
Minus the minimum green time of phase Cm, while the phase
Without a vehicle in the reverse left-turn lane.
The invention has the beneficial effects that: the invention can provide direct guidance for traffic canalization design and traffic signal control of the reverse left-turn intersection, is beneficial to reducing the safety risk of the reverse left-turn lane, exerts the service capability of the reverse left-turn lane and improves the overall performance of the intersection.
Drawings
Fig. 1 is a typical feature of an intersection branch that sets a reverse left-turn lane.
Fig. 2 shows a phase setting pattern at the reverse left-turn intersection.
Fig. 3 (a) is a phase display sequence 1 that can be adopted after the east branch of the intersection is provided with a reverse left-turn lane.
Fig. 3 (b) is a phase display sequence 2 that can be adopted after the east branch of the intersection is provided with a reverse left-turn lane.
Fig. 3 (c) is a phase display sequence 3 that can be adopted after the east branch of the intersection is provided with a reverse left-turn lane.
Fig. 3 (d) is a phase display sequence 4 that can be adopted after the east branch of the intersection is provided with a reverse left-turn lane.
Fig. 4 is a phase display sequence that can be adopted after the south-north branch of the intersection is provided with a reverse left-turn lane.
Fig. 5 is a phase display sequence that can be adopted after all branches of the intersection are provided with reverse left-turn lanes.
Detailed Description
The following embodiments are provided to further explain the present invention.
A full induction type independent signal control method for a cross reverse left-turn intersection comprises the following specific contents:
typical features of intersection branching for a reverse left-turn lane are set as shown in fig. 1. The length of an entrance lane is 50m, the width of a pedestrian crosswalk is 6m, and the width of a pedestrian crossing safety island is 2m. The distance from the upstream end of the opening for turning around the motor vehicle to the upstream end of the opening of the reverse left-turn lane is 20m, the width of the opening for turning around the motor vehicle is 5m, the width of the entrance of the reverse left-turn lane is 5m, and the distance from the downstream end of the entrance of the reverse left-turn lane to the control point of the queuing length of the vehicle is 6m.
The phase setting mode of the reverse left-turn intersection is shown in fig. 2.
Phase V1 is east import left turn phase number;
phase V2 is the Western import straight phase number;
phase V3 is the south entry left turn phase number;
phase V4 is the north-entry straight phase number;
phase V5 is the west import left turn phase number;
phase V6 is east entry straight phase number;
phase V7 is the north ingress left turn phase number;
the phase V8 is a south entry straight phase number;
phase P2 is the south pedestrian phase number;
phase P4 is the west pedestrian phase number;
phase P6 is the north pedestrian phase number;
phase P8 is the east pedestrian phase number;
if the north entrance is provided with a reverse left-turn lane, the phase C7 is the entrance phase number of the reverse left-turn lane of the north entrance;
if the east import is provided with a reverse left-turn lane, the phase C1 is the east import reverse left-turn lane entry phase number;
if the south entrance is provided with a reverse left-turn lane, the phase C3 is the entrance phase number of the reverse left-turn lane of the south entrance;
if the west entrance is provided with a reverse left-turn lane, the phase C5 is the entrance phase number of the reverse left-turn lane of the west entrance.
The minimum green light time lengths of the straight-going phase, the left-turning phase and the reverse left-turning lane entrance phase are respectively 12s, 5s and 5s. The maximum green duration for the straight phase and the left-turn phase is taken to be 40s. The time-space duration threshold is taken to be 2s.
The east branch of the intersection is provided with a phase display sequence that can be adopted after a reverse left-turn lane, as shown in fig. 3. The leading phases in fig. 3 (a) are V3, V7, V1, and V5, the leading phases in fig. 3 (b) are V3, V7, V1, and V6, the leading phases in fig. 3 (c) are V4, V7, V1, and V5, and the leading phases in fig. 3 (d) are V4, V7, V1, and V6.
The south-north branch of the intersection sets the phase display sequence that can be adopted after the reverse left-turn lane, as shown in fig. 4. The leading phases are V3, V7, V1, V5.
The phase display sequence that can be adopted after all branches of the intersection are provided with the reverse left-turn lanes is shown in fig. 5. The leading phases are V3, V7, V1, V5.
The green light sensing logic for the vehicle phase is shown in table 1, where table 1 is the green light sensing logic for the vehicle phase.
TABLE 1
The logic for sensing green light for the reverse left turn lane entry phase is shown in table 2, which is the logic for sensing green light for the reverse left turn lane entry phase in table 2.
TABLE 2
The red light sensing logic for the reverse left-turn lane entry phase, as shown in table 3, table 3 is the red light sensing logic for the reverse left-turn lane entry phase.
TABLE 3
The above embodiments are only for showing the embodiments of the present invention, but not for limiting the scope of the invention, it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the spirit of the invention, and these are all within the scope of the invention.
Claims (1)
1. A full induction type independent signal control method for a cross reverse left-turn intersection is characterized by comprising eleven aspects of symbolic description, road space layout, road traffic signal lamps, road traffic signs, road traffic markings, motor vehicle detection, phase display sequence, intersection signal control logic, motor vehicle phase green light induction logic, reverse left-turn lane entrance phase green light induction logic and reverse left-turn lane entrance phase red light induction logic, and the specific contents are as follows:
1. description of the symbols
Cm is numbered in the reverse left-turn lane entry phase;
g Cm the green duration of phase Cm;
g Vi the green duration of phase Vi;
gap Vi,l the air-current time collected by the I-th entrance lane detector of the phase Vi;
GAP Vi the idle time threshold of the phase Vi;
pj pedestrian phase number;
L Vi the total number of entrant lanes for phase Vi;
maxG Vi the maximum green time of phase Vi;
minG Cm the minimum green time of phase Cm;
minG Vi the minimum green duration of phase Vi;
vi motor vehicle phase number;
V Vi in the phase display sequence, the motor vehicle phase number of the green light is permitted to be displayed simultaneously with the phase Vi;
2. spatial layout of road
The intersection to be provided with the reverse left-turn lane is provided with 4 branches, each branch permits the motor vehicle to pass in two directions, and a left-turn entrance lane, a straight-going entrance lane and a straight right entrance lane are arranged;
setting intersection branches of reverse left-turn lanes to be arranged, wherein the length of a left-turn entrance lane is not less than 40m, and the total number of lanes of an exit road is not less than 3; if the motor vehicle with the vehicle length less than 6m turns left through the intersection by using the innermost exit lane, the turning radius is not less than 20m;
setting an intersection branch of a reverse left-turn lane, wherein the sum of the number of reverse left-turn lanes and the number of left-turn entrance lanes is less than the total number of lanes of an exit road into which left-turn vehicles enter after passing through the intersection; if the center of the road has no solid separation zone, arranging a solid isolation fence on the boundary line of the opposite roadway which is forbidden to cross; opening a reverse left-turn lane entrance at the starting point of the innermost left-turn entrance lane; opening a reversing opening of the motor vehicle at the upstream 10-30 m of the entrance of the reverse left-turn lane;
when the length of the pedestrian crossing exceeds 16m, arranging a pedestrian crossing safety island in the center of the pedestrian crossing, wherein the width of the pedestrian crossing safety island is not less than 2m;
3. road traffic signal lamp
Installing a motor vehicle signal lamp, a left-turning direction indicating signal lamp and a pedestrian signal lamp according to the regulations of the existing national standard road traffic signal lamp setting and installing standard; installing a lane signal lamp in a special form at the entrance of a reverse left-turn lane, wherein the used patterns comprise a red fork shape, a green arrow pointing to the left lower direction, and a yellow arrow pointing to the left lower direction;
the color conversion sequence of the motor vehicle signal lamp, the left turn direction indicating signal lamp and the lane signal lamp is red → green → yellow → red; the sequence of the light color conversion of the pedestrian signal light is red → green flash → red;
vehicles in the straight-going inlet lane and the straight right inlet lane pass through the intersection according to the indication of the signal lamp of the motor vehicle; vehicles in the reverse left-turn lane and the left-turn entrance lane pass through the intersection according to the indication of the left-turn direction indication signal lamp; vehicles on the upstream of the entrance of the reverse left-turn lane enter the reverse left-turn lane according to the indication of a lane signal lamp; pedestrians at the edge of the pedestrian crossing pass through the pedestrian crossing according to the indication of the pedestrian signal lamp;
the straight-going phase is a control unit of a signal lamp of the motor vehicle; the left turn phase is a control unit of a left turn direction indication signal lamp; the pedestrian phase is a control unit of a pedestrian signal lamp; the reverse left-turn lane entrance phase is a control unit of a lane signal lamp;
4. road traffic sign
According to the regulations of the existing national standard road traffic signs and marking lines, a turning-around allowing sign and a notice sign are arranged on one side of the turning-around opening of the motor vehicle, which is far away from the intersection, and characters on the notice sign are forward reverse left-turn lanes; a sign for forbidding large buses and trucks to drive in and a variable information sign are arranged on one side of the reverse left-turn lane entrance close to the intersection;
when the lane signal lamp shows green, the variable information sign shows green characters: permitting a left-turning vehicle to enter;
when the lane signal lamp shows yellow light, the variable information mark shows yellow characters: permitting a left-turning vehicle to enter;
when the lane signal lamp shows red light, the variable information mark shows red characters: forbidding a left-turning vehicle to drive in;
setting other traffic signs according to the regulations of the existing national standard road traffic signs and marking lines;
5. road traffic marking
A colorful pavement is used in the reverse left-turn lane, and no guide arrow is arranged;
referring to the regulations of the existing national standard road traffic signs and marking lines on speed reduction and parking and passing lines, a white virtual solid line is arranged at the end point of a reverse left-turn lane, a white solid line is arranged on one side far away from an intersection, and a white dotted line is arranged on one side close to the intersection;
according to the regulations of the existing national standard road traffic signs and marking lines, a single yellow solid line is arranged on one side of the reverse left-turn lane close to the center of the road; setting yellow virtual solid lines at the starting point of the reverse left-turn lane and at one side close to the edge of the exit road, prohibiting vehicles entering the intersection from using the reverse left-turn lane to cross the line, and permitting vehicles leaving the intersection to cross the line by using the reverse left-turn lane; setting a reticular wire at the entrance of the reverse left-turn lane of the innermost left-turn entrance lane;
setting other road traffic marking lines according to the regulations of the road traffic signs and marking lines of the current national standard;
6. motor vehicle detection
Installing a motor vehicle detector on each entrance lane of the motor vehicle phase, wherein the motor vehicle detector is called an entrance lane detector and is used for collecting the idle-time duration at the position 30m upstream of the stop line; the idle time is the time when the front vehicle tail leaves the detector when the rear vehicle head reaches the detector on one lane; counting the time when the air-time duration starts from the moment when the front vehicle tail leaves the detector and finishes counting the time when the rear vehicle head reaches the detector; if any part of the vehicle body is on the detector, the idle time =0s;
the method comprises the following steps that a motor vehicle detector is arranged on a reverse left-turn lane, namely a reverse left-turn lane detector, and the number of vehicles and the queuing length of the vehicles in the reverse left-turn lane are collected; when the speed of the vehicle is reduced from higher than 5km/h to 5km/h and below, the vehicle is considered to enter a queuing state; when the vehicle speed is increased from 5km/h or below to 10km/h or above, the vehicle is considered to leave the queuing state;
7. phase display sequence
The effect of reversing left turn lanes is interpreted as: during the red light period of the left-turn phase, a queuing space is provided for left-turn vehicles ready to enter the intersection; accordingly, a design principle of a phase display sequence is established for the reverse left-turn intersection;
if the north exit is provided with a reverse left-turn lane, adopting a phase display sequence of a north entrance left-turn phase front position and an east entrance straight phase rear position, wherein the north entrance left-turn phase is a downstream left-turn phase of the north entrance reverse left-turn lane entrance phase, and the east entrance straight phase is a synchronous phase of the north entrance reverse left-turn lane entrance phase;
if the east exit is provided with a reverse left-turn lane, adopting a phase display sequence of the front east entrance left-turn phase and the rear south entrance straight phase, wherein the east entrance left-turn phase is a downstream left-turn phase of the entrance phase of the east entrance reverse left-turn lane, and the south entrance straight phase is a synchronous phase of the entrance phase of the east entrance reverse left-turn lane;
if the south exit is provided with a reverse left-turn lane, adopting a phase display sequence of a south entrance left-turn phase front position and a west entrance straight phase rear position, wherein the south entrance left-turn phase is a downstream left-turn phase of the south entrance reverse left-turn lane entrance phase, and the west entrance straight phase is a synchronous phase of the south entrance reverse left-turn lane entrance phase;
if the west exit is provided with a reverse left-turn lane, adopting a phase display sequence of a west entrance left-turn phase front position and a north entrance straight phase rear position, wherein the west entrance left-turn phase is a downstream left-turn phase of the west entrance reverse left-turn lane entrance phase, and the north entrance straight phase is a synchronous phase of the west entrance reverse left-turn lane entrance phase;
in principle, the reverse left-turn lane entry phase turns on and off the green light simultaneously with its synchronous phase; starting from the red light end time of the synchronous phase, if vehicles leave the intersection in the reverse left-turn lane, forbidding the entrance phase of the reverse left-turn lane to light a green light; if the green light time of the reverse left-turn lane entrance phase cannot be ensured to reach the minimum green light time, the green light is prohibited to be turned on by the reverse left-turn lane entrance phase; after the green light is turned on at the entrance phase of the reverse left-turn lane, if the queuing length of the vehicles in the reverse left-turn lane is about to reach the entrance of the reverse left-turn lane, the green light at the entrance phase of the reverse left-turn lane should be cut off;
8. intersection signal control logic
The signal controller runs the intersection signal control logic once per second, and determines the light color of the signal lamp of each phase in the next second according to the sequence of the motor vehicle phase → the pedestrian phase → the reverse left-turn lane entrance phase; in the control process, the yellow light time of the straight-going phase, the left-turning phase and the reverse left-turning lane entrance phase is 3s, and the green light interval time between different phases and the green light time of the pedestrian phase are fixed values;
when the phase Vi displays green light, if the green light sensing logic of the phase Vi generates a green light cut-off request, the phase Vi displays yellow light in the next second, and the execution of the phases Vi to Vi is started
And
the green light interval time of each phase is long, otherwise, the phase Vi continues to display green lights, and the green light sensing logic of the phase Vi is executed;
when the phase Vi displays the yellow lamp, if the yellow lamp duration of the phase Vi is not finished, the phase Vi continues to display the yellow lamp, otherwise, the phase Vi displays the red lamp in the next second;
when phase Vi shows a red light, if
The interval duration from all phases to the phase Vi of the green light is finished, the phase Vi displays the green light in the next second, otherwise, the phase Vi continues to display the red light;
when the phase Pj displays green light, if the green light duration of the phase Pj is not finished, the phase Pj continues to display green light, otherwise, the phase Pj displays green flash light in the next second, and the phase Pj is started to be executed till the phase Pj is started to display green flash light
The green interval duration of each phase;
when the phase Pj indicates a green flash lamp,if the phase Pj to
When the green light interval duration of all the phases is finished, the phase Pj displays red light in the next second, otherwise, the phase Pj continues to display green flash light;
when the phase Pj shows red light, if
The interval duration from all the phases to the phase Pj of the green light is executed, the phase Pj displays the green light in the next second, otherwise, the phase Pj continues to display the red light;
when the phase Cm displays green light, if the green light sensing logic of the phase Cm generates a green light cut-off request, the phase Cm displays yellow light in the next second, otherwise, the phase Cm continues to display green light, and the green light sensing logic of the phase Cm is executed;
when the phase Cm displays yellow light, if the yellow light duration of the phase Cm is not completed, the phase Cm continues to display the yellow light, otherwise, the phase Cm displays red light in the next second;
when the phase Cm displays the red light, if the red light sensing logic of the phase Cm generates a red light cut-off request, the phase Cm displays the green light in the next second, otherwise, the phase Cm continues to display the red light, and the red light sensing logic of the phase Cm is executed;
9. green light sensing logic for motor vehicle phase
Setting a minimum green light time, a maximum green light time and an idle time threshold for the phase Vi; when the space-time duration acquired by one entrance lane detector is greater than a space-time duration threshold, considering that the traffic flow of the entrance lane is interrupted;
for a phase Vi with a reverse left-turn lane, a green light cut request is permitted to be generated when one of the following conditions is satisfied from when the green light duration reaches the minimum green light duration:
each entrance lane has a traffic flow discontinuity, and meanwhile, no vehicle exists in the reverse left-turn lane;
the green light duration reaches the maximum green light duration;
for a phase Vi without a reverse left-turn lane, when one of the following conditions is satisfied from when the green time period reaches the minimum green time period, a green light cut request is permitted to be generated:
each inlet lane has traffic flow discontinuity;
the green light duration reaches the maximum green light duration;
if a leading phase relative to the importation is permitted to generate a green light cut-off request, immediately generating a green light cut-off request for the same; if all post-phases relative to the imports are permitted to generate green light cut-off requests, immediately generating green light cut-off requests for them;
10. green light sensing logic for reverse left turn lane entry phase
Setting a minimum green time duration for the phase Cm, which is less than or equal to the phase
Minimum green time period of; in phase
Arranging vehicle queuing length control points in the reverse left-turn lane;
generating a green light cut-off request for the phase Cm when one of the following conditions is satisfied from when the green light time of the phase Cm reaches the minimum green light time:
phase position
The queuing length of the vehicles in the reverse left-turn lane reaches a control point;
phase position
Displaying a yellow light at the next second;
11. red light sensing logic for reverse left turn lane entry phase
A red light cut-off request is generated for the phase Cm when one of the following conditions is satisfied:
phase position
Display green light in the next second, while phase
The reverse left-turn lane has no vehicle;
phase position
The green light time is less than or equal to the phase
Minus the minimum green time of phase Cm, while the phase
Without a vehicle in the reverse left-turn lane.
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