CN113160583A - Intelligent traffic command method and system for intersection - Google Patents
Intelligent traffic command method and system for intersection Download PDFInfo
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- CN113160583A CN113160583A CN202110422145.0A CN202110422145A CN113160583A CN 113160583 A CN113160583 A CN 113160583A CN 202110422145 A CN202110422145 A CN 202110422145A CN 113160583 A CN113160583 A CN 113160583A
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/07—Controlling traffic signals
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/04—Detecting movement of traffic to be counted or controlled using optical or ultrasonic detectors
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/07—Controlling traffic signals
- G08G1/08—Controlling traffic signals according to detected number or speed of vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The invention discloses an intelligent traffic command method and system for an intersection, which are used for the intersection formed by two roads. The intelligent traffic guidance method at the intersection comprises a peak mode and an off-peak mode; in the peak mode, if the vehicle in the current lane finishes passing before the preset green light duration is over, the current lane stops passing, the next lane starts passing, and the remaining time of the current lane passing is changed into the next lane and is combined with the preset green light duration of the next lane for use; in the off-peak mode, if the vehicles on the current road finish passing before the preset green light duration of the vehicles is finished, the current road stops passing, and the other road starts passing according to the preset green light duration of the other road. The invention obviously improves the crossing passing efficiency and is beneficial to reducing the vehicle tail gas pollution.
Description
Technical Field
The invention relates to the technical field of traffic systems, in particular to an intelligent traffic command method and system for an intersection.
Background
In the modern society, with the improvement of the living standard of people and the rapid development of the automobile industry, the quantity of motor vehicles kept is increased day by day, and the function of a traffic command system is gradually highlighted. The traffic command system mainly carries out overall command on motor vehicles and the like in various road sections so as to achieve the purposes of improving traffic efficiency, traffic safety and the like. The intersection is a crossing formed by crossing at least two roads, the traffic volume is large, and the intersection is a difficult point in traffic guidance. According to different intersection roads, intersections are more in the form of crossroads, and a small number of T-intersections, five-branch intersections and the like are accompanied.
The current traffic guidance method at the intersection mainly comprises the following forms. Firstly, a fixed traffic light switching rule is set according to historical traffic data in all directions. Secondly, on the basis of the first method, the traffic light switching rules are divided into peak time periods and off-peak time periods, namely, two sets of traffic light switching rules are implemented at one intersection and are respectively used in the peak time periods and the off-peak time periods. Thirdly, according to historical traffic data of all directions in a certain time period (such as days or weeks), carrying out dynamic adjustment manually or by a system, carrying out real-time adjustment on traffic light switching rules in a future time period, and after the time period is finished, carrying out dynamic adjustment again according to the traffic data of the time period, and then carrying out the operation.
In any case, the traffic light switching rule is a fixed setting executed in the time period when the vehicle passes through the intersection. This causes the following problems. Firstly, the peak period, although crossing vehicle traffic volume is great, the traffic volume of all directions always can be different at different moments, if when a certain moment east west goes straight, probably the vehicle of east goes has already passed through and has finished, and the vehicle of west goes still is passing in succession, the vehicle of west turning south to the left at this moment, still need wait that the green lamp of east going straight goes to extinguish, the west turns south left and turns green lamp to the left and lights the back and just can pass, the left time of green lamp of east going straight is useless, this just makes the crossing traffic efficiency reduce, the congestion aggravation at peak period crossing. Secondly, there is also the problem that vehicles with green lights pass through at a certain time and vehicles in other directions still wait in white at off-peak time, and there is also a case that when no vehicle waits in each direction, if a vehicle comes from one direction and just touches a red light, even if the traffic light is switched fast, the vehicle needs to stop to wait for the green light to light up, and then the vehicle can pass through, so the passing efficiency is also obviously reduced. It is known that the reduction of the passage efficiency increases the emission of incompletely combusted pollutants when the vehicle is idling and accelerating, and affects the air quality. Therefore, a traffic guidance system capable of significantly improving the crossing traffic efficiency needs to be designed to solve the above problems.
Disclosure of Invention
The invention aims to solve the technical problem of providing an intelligent traffic command method and system for an intersection, which can obviously improve the traffic efficiency of the intersection and is beneficial to reducing the pollution of vehicle tail gas.
In order to solve the technical problems, the technical scheme of the invention is as follows: an intelligent traffic command method for an intersection formed by crossing two roads comprises a peak mode and an off-peak mode;
in the peak mode, a traffic light peak switching rule is preset, and the traffic light peak switching rule is as follows: presetting green light time length for each lane; when the preset green light duration of the current straight lane is finished, the opposite left-turning lane is used as the next lane, and the traffic starts to pass according to the preset green light duration of the opposite left-turning lane; when the preset green light duration of the current left-turn lane is finished, the left adjacent straight lane is used as the next lane, and the traffic starts to pass according to the preset green light duration of the left adjacent straight lane;
respectively detecting vehicles on each lane of the intersection, if the vehicles on the current lane pass before the preset green light duration is over, stopping the current lane and starting the next lane, and the remaining time of the current lane pass is changed into the next lane and is combined with the preset green light duration of the next lane for use;
in the off-peak mode, a traffic light off-peak switching rule is preset, and the traffic light off-peak switching rule is as follows: setting a preset green light duration for a bidirectional straight lane and a left-turn lane on the same road; stopping passing when the preset green light duration of one road is over, and starting passing by the other road according to the preset green light duration of the other road;
and respectively detecting vehicles on each road of the intersection, if the vehicles on the current road finish passing before the preset green light time length of the current road is finished, stopping the current road, and starting the other road to pass according to the preset green light time length of the other road.
In the peak mode, when the remaining passing time of each lane exceeds the preset green light time, the lane keeps passing.
As a preferable technical solution, when the off-peak mode is used for an intersection where the road is a one-way single lane, only the off-peak mode is performed.
As a preferred technical solution, when the intersection is a t-junction, only the off-peak mode is performed.
As a preferred technical solution, the method further comprises an extreme idle mode; respectively carrying out vehicle detection on each lane of the intersection, and when no vehicle passes on two roads continuously, starting from the second road in the continuous no vehicle passing mode, entering the extreme idle mode; in the extreme idle mode, the switching is carried out according to the off-peak switching rule of the traffic lights; in the extreme idle mode, when one road detects a vehicle, the road is switched to green light for passing immediately, and the off-peak mode is switched.
Preferably, the right-turn lanes on each of the roads keep passing.
As a preferable technical scheme, the crosswalk at the intersection and the same-row straight lane pass synchronously.
A command system of an intelligent traffic command method of an intersection is arranged at an intersection formed by two roads, two-way separation lines are respectively arranged outside the intersection on each road, a straight lane and a left-turn lane are respectively arranged on the entry side of each road on the two-way separation lines, the command system comprises a vehicle detection device arranged on the entry side of each two-way separation line, traffic indicator lamps are respectively arranged opposite to the entry side of each two-way separation line, the vehicle detection device is in signal connection with a control unit, and the output end of the control unit is in signal connection with the traffic indicator lamps.
Preferably, the vehicle detection device includes a straight vehicle detector that detects a straight lane vehicle corresponding to the entrance side, and a left-turn vehicle detector that detects a left-turn lane vehicle corresponding to the entrance side; the traffic indicator lamp comprises a straight running indicator lamp for indicating the traffic of the straight running lane corresponding to the access side and a left turning indicator lamp for indicating the traffic of the left turning lane corresponding to the access side.
Preferably, the vehicle detection device includes a passing vehicle detector that detects all vehicles corresponding to the straight lane and the left-turn lane on the entrance side, and the traffic light includes a passing light that indicates that the straight lane and the left-turn lane corresponding to the entrance side pass together.
Due to the adoption of the technical scheme, the invention can transfer the remaining time of the passing of a certain vehicle to the next lane for a long time in the peak time period, thereby reducing the waiting time of the vehicles on the next lane and improving the traffic volume in unit time; in off-peak time, the vehicle can be switched to another road to pass in advance after a certain road has no vehicles, so that the waiting time of vehicles on the other road is reduced, and the traffic volume in unit time is increased. Therefore, the invention obviously improves the crossing traffic efficiency and is beneficial to reducing the vehicle tail gas pollution.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a second embodiment of the present invention;
FIG. 3 is a schematic diagram of a third embodiment of the present invention;
the directions of the upper north, the lower south, the left, the west and the right are indicated in the figures.
In the figure: 1-road; 11-bidirectional parting lines; 12-a straight-through lane; 13-left turn lane; 2-east west way; 3-north-south road; 4-north way; 5-vehicle detection means; 51-a straight-ahead vehicle detector; 52-left turn vehicle detector; 53-passing vehicle detector; 6-traffic light; 61-straight indicator light; 62-left turn indicator light; 63-pass indicator light; 7-crosswalk; 8-crossing.
Detailed Description
The invention is further illustrated below with reference to the figures and examples. In the following detailed description, exemplary embodiments of the invention are described by way of illustration only. Needless to say, a person skilled in the art realizes that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.
The first embodiment is as follows:
as shown in fig. 1, an intelligent traffic guidance method for an intersection is used at an intersection 8 formed by two roads 1 crossing. The method includes a peak mode and an off-peak mode.
In the peak mode, a traffic light peak switching rule is preset, and the traffic light peak switching rule is as follows: presetting green light time length for each lane; when the preset green light duration of the current straight lane 12 is over, the opposite left-turning lane 13 is used as the next lane, and the traffic starts to pass according to the preset green light duration of the opposite left-turning lane 13; when the preset green light duration of the front left-turn lane 13 is over, the left adjacent straight lane 12 is used as the next lane, and the traffic starts to pass according to the preset green light duration of the left adjacent straight lane 12.
The present embodiment is illustrated by crossing the east-west road 2 and the north-south road 3 to form the intersection 8. In the traffic light peak switching rule, the preset green light time of the south-north going straight lane 12 is 50s, the preset green light time of the south-north turning lane 13 is 30s, the preset green light time of the east-west going straight lane 12 is 40s, and the preset green light time of the east-west turning lane 13 is 20 s.
And in the peak mode, respectively detecting vehicles on each lane of the intersection 8, if the vehicles on the current lane pass before the preset green light duration is over, stopping the current lane and starting the next lane, and if the remaining time of the current lane pass is long, turning to the next lane and combining the time with the preset green light duration of the next lane for use.
When the actual intersection 8 passes through, the traffic lights of the previous intersection 8 are not matched in passing time, accidents, construction and the like in the middle of the road 1 influence the passing of vehicles, the number of the vehicles passing through the initial part and the last part of the peak time is not uniform, and the number of the vehicles to pass through in the same lane at different moments is different under the influence of various factors. According to the embodiment, the remaining time is transferred to the next lane for passing according to the signal that the passing is finished in advance, so that the waiting time of vehicles on the next lane can be reduced, the traffic volume in unit time is increased, and the passing efficiency is improved.
The above examples are also illustrative. If the vehicles in the north straight lane 12 finish passing in 40s, the green light of the north straight lane 12 is switched to the red light, and the passing is stopped; the green light of the next lane, i.e., the opposite south-to-east left-turn lane 13, is turned on to start traffic. The left time of the north-going straight-ahead lane 12 is 50s-40 s-10s, the opposite south-east-turn left-turn lane 13 is turned into, and the left-right-turn lane is used together with the preset passing time of the opposite south-east-turn left-turn lane 13, so that the actual passing time of the opposite south-east-turn left-turn lane 13 is changed into 30s +10 s-40s at the moment, and the passing time is 10s longer than that of normal passing. In the initial 10s of the green light passing of the south-to-east left-turn lane 13, the green light passes through the adjacent south-going straight lane 12 at the same time, and the two lanes do not have route intersection, so that the intersection 8 can be ensured to normally pass.
Thereafter, the intersection 8 still follows the rule of remaining duration carry forward, and there are two cases thereafter.
In the first case, there are fewer vehicles in the opposite south-to-east left-turn lane 13, and if the vehicles pass through at 25s, the south-to-east left-turn lane 13 stops passing and the next lane, i.e., the west-going straight lane 12, starts passing. Since the vehicle in the south-to-east left-turn lane 13 has passed for 25 seconds, the south-going straight lane 12 has already ended passing at the end of the preset passing duration of 50 seconds, and the next lane, i.e., the north-to-west left-turn lane 13, has passed for 15 seconds under green light. So after the south-east-turn left-turn lane 13 has finished passing after 25s, the left-east-turn left-turn lane 13 has passed for a remaining length of time of 40s-25 s-15s, which 15s ends up passing into the west-straight lane 12. At the moment, the left-turn lane 13 turning from north to west and the straight-going lane 12 going from west pass simultaneously, the crossing of the passing routes does not occur, and the normal passing of the intersection 8 can be ensured.
In the second case, the vehicles in the south-to-east left-turn lane 13 are more, the vehicles always keep passing within the actual passing time of 40s, after the 40s is finished, the west-to-east straight lane 12 and the east-to-go straight lane 12 start to pass simultaneously, and the normal preset traffic light peak switching rule is recovered.
Of course, there may be situations where there are fewer vehicles in both the north-going straight-ahead lane 12 and the south-going straight-ahead lane 12, and there may be a tie-up in both, which forms a rule similar to the traffic light peak switching rule, except that the transit time for both corresponding next lanes is longer. This case is equally understood as the second case described above and will not be described in detail here.
Wherein, based on the first situation, an extreme situation may occur in which the vehicles in the north-going straight lane 12 and the vehicles in the next lane, i.e., the south-to-east left-turn lane 13, are few in both lanes; if the vehicles in the north-going straight-ahead lane 12 and the south-turning east-left-turning lane 13 all finish using 10s, the time for finally turning to the west-going straight-ahead lane 12 is 50s-10s +30s-10 s-60 s. And when the vehicles in the north straight lane 12 and the south-to-east left-turn lane 13 all pass, the south straight lane 12 still has the passing time of 30s, and if the vehicles pass through the west straight lane 12, the situation that the west straight lane and the south straight lane are crossed occurs.
In order to avoid the extreme situation, in the peak mode, the traffic of each lane is kept passing when the remaining time of the traffic exceeds the preset green light time of the lane. I.e. for the extreme case mentioned above, the remaining duration of the south-to-east left-turn lane 13 is kept green for passage before its preset green duration of 30 s. The south-east left-turn lane 13 will eventually remain on for a traffic duration of 50s-10s +30 s-40s plus 10s for the last lane, i.e., the north-straight lane 12, at the end of 50s, the south-straight lane 12 has finished passing. The south-to-east left-turn lane 13 turns 30s into the next lane, namely the west-going straight lane 12, and the west-going straight lane 12 has 30s +40 s-70 s actual passing time; the south-going straight lane 12 is switched to the north-to-west left-turning lane 13, the north-to-west left-turning lane 13 passes according to the preset passing time of 30s, and the passing route of the vehicles of the north-to-west left-turning lane 13 and the west-going straight lane 12 does not intersect, so that the normal passing of the intersection 8 can be ensured. Therefore, under the limitation that the traffic time of each lane is kept passing when the remaining time of the traffic of each lane exceeds the preset green light time of the intersection, the intersection 8 executes the peak mode, and the effects of reducing the waiting time of each lane and improving the passing efficiency can be realized on the premise of ensuring normal passing.
In the off-peak mode, a traffic light off-peak switching rule is preset, and the traffic light off-peak switching rule is as follows: setting a preset green light duration for the two-way straight lane 12 and the left-turn lane 13 on the same road 1; and stopping passing when the preset green light duration of one road 1 is over, and starting passing the other road 1 according to the preset green light duration of the other road 1.
This embodiment is also illustrated by the intersection 8 formed by the intersection of the east-west road 2 and the north-south road 3. Under the traffic light off-peak switching rule, the preset passing time of all the straight lanes 12 and the left-turn lanes 13 on the south-north road 3 is set to be 30s, and the preset green light time of all the straight lanes 12 and the left-turn lanes 13 on the east-west road 2 is set to be 20 s.
And respectively detecting the vehicles on each road 1 of the intersection 8, if the vehicles on the current road 1 finish passing before the preset green light duration of the vehicles is finished, stopping the current road 1, and starting the other road 1 to pass according to the preset green light duration of the other road 1.
The above examples are also illustrative. When the number of vehicles on the east-west road 2 is small and the vehicles on the east-west road 2 finish passing in 15s, the green light of the east-west road 2 is switched into the red light at the moment, and the passing is stopped; and the red light of the south road 3 is switched to the green light to start passing. Therefore, vehicles on the south-north road 3 equivalently realize passing in advance for 30s-15s, waiting time is shortened, and passing efficiency is improved. When a certain road 1 passes, such as the south-north road 3, all the straight lanes 12 and the left-turn lanes 13 in the south-north direction pass, which is very common in off-peak periods when vehicles are not much, and normal passing at the intersection 8 can be realized.
In the off-peak mode, there are also extreme cases where neither the east-west road 2 nor the north-south road 3 has a vehicle at a certain time. If the rule of switching right away by passing the vehicle in advance is implemented, the traffic lights are frequently switched between the north-south road 3 and the east-west road 2, which obviously is not favorable for normal traffic guidance.
Based on the above extreme cases, the present embodiment further includes an extreme idle mode. Respectively carrying out vehicle detection on each lane of the intersection 8, and when no vehicle passes on the two roads 1 continuously, starting from the second road 1 in which no vehicle passes continuously, entering the extreme idle mode; in the extreme idle mode, the switching is carried out according to the off-peak switching rule of the traffic lights; in the extreme idle mode, when one of the roads 1 detects a vehicle, the road 1 is switched to green light for passing immediately, and the off-peak mode is switched.
The above examples are also described here. When east-west way 2 and north-south way 3 all have no vehicle, east-west way 2 detects no car, and the condition that the vehicle has passed through in advance just in fact is equivalent to, according to the rule of off-peak mode, switches to north-south way 3 and passes this moment. And the south and north road 3 also detects no vehicle at this moment, but accords with the situation that no vehicle passes through continuously appearing on the two roads 1 at this moment, then starts from the second road 1 in which no vehicle passes through continuously appearing, namely the south and north road 3, enters the extremely idle mode, and carries out according to the traffic light off-peak switching rule. Namely, the south-north road 3 normally passes according to the preset waiting time length of 30s, then the south-north road 2 is switched to the east-west road 2 to pass according to the normal preset waiting time length of 20s, and the steps are repeated in a circulating mode. This is suitable for the case where the number of vehicles is extremely small, such as at night.
Inevitably, there will be individual vehicle passing in the extreme idle mode, and when there is a vehicle detected on one of the roads 1, such as the east-west road 2 in the above example, then the green light passing on the east-west road 2 is switched immediately and the off-peak mode is switched. In the off-peak mode, the east-west road 2 is detected as the passing time of the vehicle, and if the vehicle passes after 5s, the east-west road 2 stops passing and the north-south road 3 starts passing. If the north-south road 3 still has no vehicles at this time, the east-west road 2 is immediately switched back again according to the rule of the off-peak mode. At this time, if the east-west road 2 has no vehicles, the passage of the east-west road 2 is started, and the extremely idle mode is switched again.
Through the rule setting of above-mentioned peak mode, off-peak mode and extremely idle mode, can be at any number of traffic, any time of traffic, the homoenergetic realizes reducing vehicle waiting time, improves current efficiency, does benefit to the effect that reduces tail gas pollution.
Wherein conventionally, the right-turn lanes on each of the roads 1 keep passing, and the crosswalk 7 at the intersection 8 passes in synchronization with the passing of the codirectional straight lane 12.
A command system of an intelligent traffic command method at an intersection is arranged at an intersection 8 formed by crossing two roads 1, two-way separation lines 11 are respectively arranged outside the intersection 8 on each road 1, and a straight lane 12 and a left-turn lane 13 are respectively arranged at the side of an entrance 8 of each road 1 on each two-way separation line 11. Of course, a right-turn lane is also arranged, and the right-turn lane can be independently arranged and can also be combined with the straight lane 12; and pedestrian crosswalks 7 are arranged on the roads 1 near the intersection 8.
The system comprises a vehicle detection device 5 arranged at the side of an access opening 8 of each bidirectional separation line 11, wherein the vehicle detection device 5 can adopt a radar sensor, a detection camera and the like. The opposite surfaces of the two-way separation lines 11 on the side of the access port 8 are respectively provided with a traffic indicator lamp 6, the vehicle detection device 5 is in signal connection with a control unit, and the output end of the control unit is in signal connection with the traffic indicator lamps 6.
For a road 1 having at least one straight-going lane 12 and one left-turn lane 13 in one direction, the vehicle detecting device 5 includes a straight-going vehicle detector 51 that detects vehicles corresponding to the straight-going lane 12 on the side of the intake opening 8, and a left-turn vehicle detector 52 that detects vehicles corresponding to the left-turn lane 13 on the side of the intake opening 8; the traffic light 6 includes a straight running light 61 indicating that the vehicle is running in a straight running lane 12 corresponding to the side of the access port 8, and a left turn light 62 indicating that the vehicle is running in a left turn lane 13 corresponding to the side of the access port 8.
According to the method of the present embodiment, the control unit sets the fixed period to the peak mode, as 7 a.m.: 00-8: 30 and 5 pm: 00-6: the rest of the time, off-peak mode is performed 30, and during periods when the vehicle is rare, such as nighttime periods, it is possible to switch between off-peak mode and extreme idle mode. The straight-going vehicle detector 51 detects whether the vehicle in the straight-going lane 12 is in a state or not, the left-turning vehicle detector 52 detects whether the vehicle in the left-turning lane 13 is in a state or not, and feeds back the state to the control unit, and the control unit controls the traffic lights of the straight-going indicator light 61 and the left-turning indicator light 62 to be switched according to the state of the vehicle.
Example two:
as shown in fig. 2, when the present method is applied to an intersection 8 where the road 1 is a one-way single lane, only the off-peak mode is performed. The intersection 8 formed by the one-way single lane is the intersection 8 with less traffic flow, and the off-peak mode can be carried out to realize the effects of reducing the waiting time and improving the traffic efficiency. Of course, during extreme idle periods such as nighttime, it is equally possible to switch between the off-peak mode and the extreme idle mode. The off-peak mode of the intersection 8 formed by the one-way single-lane road 1 is easily understood by those skilled in the art with reference to the rule of the off-peak mode in the embodiment, and is not described herein again.
Correspondingly, the vehicle detection device 5 of the system comprises a passing vehicle detector 53 for detecting all vehicles corresponding to the straight lane 12 and the left-turn lane 13 on the side of the access point 8, and the traffic indicator lamp 6 comprises a passing indicator lamp 63 for indicating that the straight lane 12 and the left-turn lane 13 corresponding to the side of the access point 8 pass together.
Example three:
as shown in fig. 3, when the method is used for the intersection 8 being a t-intersection 8, only the off-peak mode is performed. Taking the east-west road 2 and the north-direction road 4 to form the t-junction 8 as an example, in the off-peak mode, the east-west road 2 uses the preset passage time length 30s together, and the north-direction road 4 uses the preset passage time length 20s together. When the vehicles on the east-west road 2 pass through the lane in advance, the green light of the east-west road 2 is switched to the red light, the red light of the north road 4 is switched to the green light, and the vehicles on the north road 4 can pass from north to west. Therefore, the passing routes of the vehicles in all directions are not easy to intersect, and the effects of reducing waiting time and improving passing efficiency can be completely realized on the premise of ensuring normal passing. Similarly, when neither east-west road 2 nor north-bound road 4 is driving, it is also possible to enter an extreme idle mode and to switch between the off-peak mode and the extreme idle mode after an incoming vehicle.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. An intelligent traffic command method for an intersection formed by crossing two roads is characterized in that:
including peak and off-peak modes;
in the peak mode, a traffic light peak switching rule is preset, and the traffic light peak switching rule is as follows: presetting green light time length for each lane; when the preset green light duration of the current straight lane is finished, the opposite left-turning lane is used as the next lane, and the traffic starts to pass according to the preset green light duration of the opposite left-turning lane; when the preset green light duration of the current left-turn lane is finished, the left adjacent straight lane is used as the next lane, and the traffic starts to pass according to the preset green light duration of the left adjacent straight lane;
respectively detecting vehicles on each lane of the intersection, if the vehicles on the current lane pass before the preset green light duration is over, stopping the current lane and starting the next lane, and the remaining time of the current lane pass is changed into the next lane and is combined with the preset green light duration of the next lane for use;
in the off-peak mode, a traffic light off-peak switching rule is preset, and the traffic light off-peak switching rule is as follows: setting a preset green light duration for a bidirectional straight lane and a left-turn lane on the same road; stopping passing when the preset green light duration of one road is over, and starting passing by the other road according to the preset green light duration of the other road;
and respectively detecting vehicles on each road of the intersection, if the vehicles on the current road finish passing before the preset green light time length of the current road is finished, stopping the current road, and starting the other road to pass according to the preset green light time length of the other road.
2. The intelligent traffic guidance method at the intersection according to claim 1, characterized in that: and in the peak mode, keeping passing when the passing residual time of each lane exceeds the preset green light time.
3. The intelligent traffic guidance method at the intersection according to claim 1, characterized in that: and when the method is used for the crossroads of which the roads are one-way single lanes, only the off-peak mode is carried out.
4. The intelligent traffic guidance method at the intersection according to claim 1, characterized in that: and when the intersection is a T-shaped intersection, only performing the off-peak mode.
5. The intelligent traffic guidance method at the intersection according to claim 1, characterized in that: also includes an extreme idle mode; respectively carrying out vehicle detection on each lane of the intersection, and when no vehicle passes on two roads continuously, starting from the second road in the continuous no vehicle passing mode, entering the extreme idle mode; in the extreme idle mode, the switching is carried out according to the off-peak switching rule of the traffic lights; in the extreme idle mode, when one road detects a vehicle, the road is switched to green light for passing immediately, and the off-peak mode is switched.
6. The intelligent traffic guidance method at the intersection according to claim 1, characterized in that: and keeping the right-turn lane on each road passing.
7. The intelligent traffic guidance method at the intersection according to claim 1, characterized in that: and the pedestrian crosswalk at the intersection and the straight-going lane in the same line pass synchronously.
8. The command system of an intelligent traffic command method at an intersection according to any one of claims 1 to 7, which is arranged at an intersection formed by two roads, each road is provided with a bidirectional separation line outside the intersection, each road is provided with a straight lane and a left-turn lane at the entrance side of the bidirectional separation line, and the command system is characterized in that: the traffic signal detection device comprises vehicle detection devices arranged on the entrance sides of the two-way separation lines, wherein traffic indicator lamps are respectively arranged opposite to the entrance sides of the two-way separation lines, the vehicle detection devices are in signal connection with a control unit, and the output end of the control unit is in signal connection with the traffic indicator lamps.
9. The system for directing intelligent traffic directing at intersections according to claim 8, wherein: the vehicle detection device includes a straight-going vehicle detector that detects a straight-going lane vehicle corresponding to the entrance side, and a left-turn vehicle detector that detects a left-turn lane vehicle corresponding to the entrance side; the traffic indicator lamp comprises a straight running indicator lamp for indicating the traffic of the straight running lane corresponding to the access side and a left turning indicator lamp for indicating the traffic of the left turning lane corresponding to the access side.
10. The system for directing intelligent traffic directing at intersections according to claim 8, wherein: the vehicle detection device comprises a passing vehicle detector for detecting all vehicles corresponding to a straight lane and a left-turn lane on the side of the access port, and the traffic indicator lamp comprises a passing indicator lamp for indicating that the straight lane and the left-turn lane corresponding to the side of the access port pass together.
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