CN113284338A - Method for calculating influence of motor vehicle emergency avoidance no-lamp control pedestrian crossing on traffic flow - Google Patents
Method for calculating influence of motor vehicle emergency avoidance no-lamp control pedestrian crossing on traffic flow Download PDFInfo
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- CN113284338A CN113284338A CN202110441614.3A CN202110441614A CN113284338A CN 113284338 A CN113284338 A CN 113284338A CN 202110441614 A CN202110441614 A CN 202110441614A CN 113284338 A CN113284338 A CN 113284338A
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Abstract
The invention discloses a method for calculating the influence of motor vehicles to traffic flow in emergency avoidance of a pedestrian crosswalk without lamp control. Collecting and processing traffic data of motor vehicles passing through a crosswalk without lamp control; quantitatively analyzing the average speed and the acceleration when a motor vehicle driver takes emergency avoidance measures when passing through a pedestrian crosswalk without lamp control; according to the emergency avoidance characteristics of the motor vehicle, the running speed and displacement of the motor vehicle at the position of the no-lamp control pedestrian crossing during emergency avoidance are calculated in a quantized mode; according to three variable parameters of different pedestrian crossing probabilities, different motor vehicle maximum speed limits and different motor vehicle densities, motor vehicles take emergency avoidance measures and calculate corresponding road traffic flows; according to the corresponding traffic flow basic diagram and the road space-time diagram under the three variable parameters, the influence of the emergency avoidance behavior of the motor vehicle on the traffic flow is quantized. The invention can not only implement proper traffic management measures for traffic management departments, but also improve the safety of pedestrian crossing and the timeliness of motor vehicle driving.
Description
Technical Field
The invention belongs to the field of traffic planning management, and particularly relates to a method for calculating the influence of motor vehicles on traffic flow when emergently avoiding a pedestrian crosswalk without lamp control.
Background
According to the traffic rules, when the motor vehicle passes through the pedestrian crossing, the motor vehicle should be decelerated to run; when a pedestrian passes through the pedestrian crossing, the vehicle should be stopped to give way; when the motor vehicle runs through a road without traffic signals, the motor vehicle should avoid when a pedestrian crosses the road. However, in order to seek more convenient driving experience and higher driving efficiency, motor vehicle drivers in urban roads generally do not select active avoidance when passing through the non-light-controlled pedestrian crossing, so that pedestrian and vehicle conflict at the non-light-controlled pedestrian crossing is serious.
With the further enhancement of the related management system for pedestrian crossing on the pedestrian crossing without lamp control, the motor vehicle must stop in front of the pedestrian crossing and continue to run after the pedestrian crossing is finished as long as the pedestrian stands on the pedestrian crossing or at the edge of the pedestrian crossing. However, some pedestrian crossings without lamp control in cities do not provide reasonable traffic-letting environmental conditions due to the limitation of road environmental conditions, such as the pedestrians crossing the street are shielded by barriers, so that the pedestrians cannot be found in time by a driver, the marking lines of the pedestrians are not obvious enough, the driving speed of the driver is too high, and the like. Strict traffic management measures conflict with unreasonable road yielding environments, and not only can the development appearance of road traffic be effectively improved, but also new urban traffic potential safety hazards can be formed.
Therefore, in order to fit the actual traffic condition, the influence of the motor vehicle on the traffic flow caused by the emergency avoidance of the pedestrian crosswalk without the lamp control is simply and efficiently calculated to detect whether the policy of forcibly applying courtesy pedestrians under the current road traffic environment is reasonable or not, so that not only can proper traffic management measures be implemented for traffic management departments, but also the safety of pedestrian crossing streets and the timeliness of motor vehicle driving can be improved.
Disclosure of Invention
In order to solve the technical problems mentioned in the background technology, the invention provides a method for calculating the influence of the motor vehicle emergency avoidance on the traffic flow of the pedestrian crosswalk without lamp control.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
a method for calculating the influence of an emergency avoidance no-lamp control pedestrian crossing of a motor vehicle on traffic flow comprises the following steps:
(1) collecting and processing traffic data of motor vehicles passing through a crosswalk without lamp control, wherein the traffic data comprises intersection position coordinates, motor vehicle motion position coordinates, motor vehicle acceleration data and motor vehicle speed data;
(2) quantitatively analyzing the average speed and the acceleration when a motor vehicle driver takes emergency avoidance measures when passing through a pedestrian crosswalk without lamp control;
(3) according to the emergency avoidance characteristics of the motor vehicle, the running speed and displacement of the motor vehicle at the position of the no-lamp control pedestrian crossing during emergency avoidance are calculated in a quantized mode;
(4) according to three variable parameters of different pedestrian crossing probabilities, different motor vehicle maximum speed limits and different motor vehicle densities, motor vehicles take emergency avoidance measures and calculate corresponding road traffic flows;
(5) according to the corresponding traffic flow basic diagram and the road space-time diagram under the three variable parameters, the influence of the emergency avoidance behavior of the motor vehicle on the traffic flow is quantized.
Further, in the step (1), selecting a light-control-free pedestrian crossing combining environmental restrictions and traffic supervision measures as a data acquisition point, wherein the environmental restrictions comprise dense pedestrian flow on two sides of a road around the light-control-free pedestrian crossing, dense residential areas, business areas and/or schools distributed along the road, and areas with insufficient sight distance triangles at two ends of a road section of the pedestrian crossing and the light-control-free pedestrian crossing; the traffic supervision measures comprise traffic police on-duty supervision, illegal photographing and citizen photographing reporting.
Further, in the step (1), a method combining manual observation and video recording is adopted to collect data.
Further, in the step (2), after the operation data of the motor vehicle taking emergency avoidance measures and passing through the crosswalk without lamp control is processed, drawing a corresponding speed curve and an acceleration curve; obtaining the speed limit on the pedestrian crosswalk without lamp control and the average speed value V which can be reached by the motor vehicle before taking emergency avoidance measures through quantitative analysis of the speed curve; through quantitative analysis of acceleration curve, the machine is obtainedAverage maximum acceleration a that can be achieved by a motor train when emergency avoidance measures are takenmax。
Further, in the step (3), the actual road length is divided into a plurality of units with the same interval, the width of each unit is the same as the actual road width, and the length of each unit is used for expressing the length of the motor vehicle; using a certain position of the unit as a crosswalk without lamp control, generating a street pedestrian with a probability p, and using motor vehicles near a stop line with the same probability p and an acceleration amaxGenerating an emergency braking action; each unit has a unique state value at any time, and if there is a vehicle in the current unit, the speed value v of the vehicle is returnednOtherwise the unit returns a value of 0 or Null, velocity value vnThe number of units passed by the motor vehicle per second at the current moment is represented; and adopting a periodic boundary condition and updating the position according to a set time interval.
Further, pedestrians and vehicles operate as follows:
(a) in unit xnGenerating street-crossing pedestrians with probability p;
(b) setting the random slowing of the motor vehicle to reflect the random deceleration behavior of a driver due to the influence of the environment, and updating the speed of the motor vehicle after the random slowing:
vn+1＝max(vn-1,0)
(c) setting motor vehicle acceleration to show that a driver expects to run at the maximum speed, and updating the speed after acceleration:
vn+1＝min(vn+1,vmax)
(d) detecting the safe distance d between the following vehicle and the front vehiclenAnd performing speed updating:
vn+1＝min(vn,dn)
(e) setting an emergency braking action for the motor vehicle near the pedestrian crossing without lamp control, and updating the speed after the emergency braking:
vn+1＝max(vn-1,0)
(f) and (3) updating the position:
xn+1＝xn+vn
in the above formula, xnIndicating the vehicle position at the current time;
(g) and (c) returning to the step (c) according to a set time interval for circulation.
Further, the periodic boundary conditions are as follows:
after the position is updated for one time, if the updated position does not exceed the length of the road, the motor vehicle continues to run according to the original rule; if the updated position exceeds the road length, the motor vehicle returns to the starting point and becomes a tail vehicle, and the motor vehicle behind the motor vehicle becomes a head vehicle.
Further, in the step (4), street pedestrians are arranged at the position of the light-free control pedestrian crossing, different traffic attraction points on two sides of the road and the space-time characteristics of the traffic of the street pedestrians are considered, different pedestrian street crossing probabilities p are arranged for the light-free control pedestrian crossing, and emergency braking is generated with the same probability p when the motor vehicle runs to the light-free control pedestrian crossing; according to the average speed of the motor vehicles obtained in the step (2), different road grades and urban traffic environments are considered, and different maximum speed limits are carried out on the motor vehicles; different motor vehicle densities are set for the roads by considering that different commercial areas and traffic volumes of the urban roads are influenced by the early and late peaks and holidays.
Further, in step (4), the road traffic flow f is calculated as follows:
wherein rho is the density of the motor vehicle,
n is the number of motor vehicles, L is the road length,
is the average speed of all the vehicles,
viis the speed of the ith vehicle.
Further, in the step (5), setting different pedestrian street crossing probabilities and different motor vehicle maximum speed limits as variable parameters, and drawing a two-dimensional basic graph with density as a horizontal coordinate and traffic as a vertical coordinate according to a calculation result; setting different road densities, and drawing a space-time diagram according to the calculation result, wherein the abscissa of the space-time diagram represents a space position, and the ordinate represents time.
Adopt the beneficial effect that above-mentioned technical scheme brought:
the invention is helpful to perfect a calculation method for quantizing the running state of the vehicle, the existing traffic calculation method can quantize the influence of the emergency braking action of the motor vehicle on the traffic flow, and a new thought is provided for quantizing the motion state of the motor vehicle and improving the traffic state according to the emergency braking action of the motor vehicle under the pedestrian crosswalk without lamp control.
The design of the non-light-controlled pedestrian crossing is beneficial to reducing unnecessary delay of pedestrians and motor vehicles in the passing process, but some non-light-controlled pedestrian crossings in cities are limited by road environments and facilities, and strict traffic management measures conflict with unreasonable road yielding environments, so that the development appearance of road traffic cannot be effectively improved, and new urban traffic potential safety hazards can be formed. The invention can be used for solving the actual traffic problem, improving the infrastructure, setting the induction facility to remind the driver to take braking measures in advance, improving the design of the pedestrian crossing facility without lamp control, avoiding the adverse effect generated by emergency braking, and having great practical significance for ensuring the safety of pedestrians and maintaining the running order of motor vehicles.
Through the invention, reasonable suggestions are provided for the traffic problems of the pedestrian crossing without lamp control in the urban road, the healthy development of urban road traffic is ensured, and the people-oriented travel requirements are met.
Drawings
FIG. 1 is an overall flow diagram of the present invention;
FIG. 2 is a schematic view of the surroundings of a data acquisition site in an embodiment;
FIG. 3 is a flow chart of quantifying emergency avoidance behavior of a motor vehicle in accordance with the present invention;
FIG. 4 is a microscopic view of the pilot road in the example.
Detailed Description
The technical scheme of the invention is explained in detail in the following with the accompanying drawings.
The invention designs a method for calculating the influence of an emergency avoidance no-lamp control pedestrian crossing of a motor vehicle on traffic flow, which comprises the following steps as shown in figure 1:
step 1: collecting and processing traffic data of motor vehicles passing through a crosswalk without lamp control, wherein the traffic data comprises intersection position coordinates, motor vehicle motion position coordinates, motor vehicle acceleration data and motor vehicle speed data;
step 2: quantitatively analyzing the average speed and the acceleration when a motor vehicle driver takes emergency avoidance measures when passing through a pedestrian crosswalk without lamp control;
and step 3: according to the emergency avoidance characteristics of the motor vehicle, the running speed and displacement of the motor vehicle at the position of the no-lamp control pedestrian crossing during emergency avoidance are calculated in a quantized mode;
and 4, step 4: according to three variable parameters of different pedestrian crossing probabilities, different motor vehicle maximum speed limits and different motor vehicle densities, motor vehicles take emergency avoidance measures and calculate corresponding road traffic flows;
and 5: according to the corresponding traffic flow basic diagram and the road space-time diagram under the three variable parameters, the influence of the emergency avoidance behavior of the motor vehicle on the traffic flow is quantized.
Preferably, in step 1, an actual light-controlled pedestrian crossing in an urban area is selected, dense residential areas, commercial areas, schools and the like are distributed along the road, dense poplar trees are planted on two sides of the road section, the light-controlled pedestrian crossing is arranged, a bad courtesy environment with strict supervision measures is arranged under the light-controlled pedestrian crossing and serves as a data acquisition place as shown in fig. 2, and a method combining a manual observation method and a mobile phone video recording method is adopted for data acquisition. The collected videos can be subjected to data processing through George2.1 software, and parameters such as intersection position coordinate information, motor vehicle speed, acceleration, track coordinates and the like are obtained after the steps of video reading, basic point calibration, coordinate conversion, object track capture and the like.
Preferably, in the step 2, after the operation data of the motor vehicle taking emergency avoidance measures and passing through the crosswalk without lamp control is processed, drawing a corresponding speed curve and an acceleration curve; obtaining the speed limit on the pedestrian crosswalk without lamp control and the average speed value V which can be reached by the motor vehicle before taking emergency avoidance measures through quantitative analysis of the speed curve; through quantitative analysis of the acceleration curve, the average maximum acceleration a which can be reached by the motor vehicle when an emergency avoidance measure is taken is obtainedmax。
Preferably, in step 3, the actual road length is divided into a plurality of units with the same interval, the width of each unit is the same as the actual road width, and the length of each unit is used for indicating the length of the motor vehicle; using a certain position of the unit as a crosswalk without lamp control, generating a street pedestrian with a probability p, and using motor vehicles near a stop line with the same probability p and an acceleration amaxGenerating an emergency braking action; each unit has a unique state value at any time, and if there is a vehicle in the current unit, the speed value v of the vehicle is returnednOtherwise the unit returns a value of 0 or Null, velocity value vnThe number of units passed by the motor vehicle per second at the current moment is represented; and adopting a periodic boundary condition and updating the position according to a set time interval.
As shown in fig. 3, the pedestrian and the vehicle operate as follows:
a. in unit xnGenerating street-crossing pedestrians with probability p;
b. setting the random slowing of the motor vehicle to reflect the random deceleration behavior of a driver due to the influence of the environment, and updating the speed of the motor vehicle after the random slowing:
vn+1＝max(vn-1,0)
c. setting motor vehicle acceleration to show that a driver expects to run at the maximum speed, and updating the speed after acceleration:
vn+1＝min(vn+1,vmax)
d. detecting the safe distance d between the following vehicle and the front vehiclenAnd performing speed updating:
vn+1＝min(vn,dn)
e. setting an emergency braking action for the motor vehicle near the pedestrian crossing without lamp control, and updating the speed after the emergency braking:
vn+1＝max(vn-1,0)
f. and (3) updating the position:
xn+1＝xn+vn
in the above formula, xnIndicating the vehicle position at the current time;
g. and c, returning to the step c according to a set time interval for circulation.
Preferably, after the position is updated once, if the updated position does not exceed the length L of the road, the motor vehicle continues to run according to the original rule; if the updated position exceeds the road length L, the motor vehicle returns to the starting point and becomes a tail vehicle, and the motor vehicle behind the motor vehicle becomes a head vehicle.
In the present embodiment, as shown in fig. 4, a road segment length of a single vehicle in a city is represented by L1000 units, the width is 3.6m, a road space is divided into units with equal intervals, the unit interval is 4.5m long, the length of a representative actual vehicle is 4.5m, and an unmanned crosswalk is provided at L600.
Preferably, in the step 4, street pedestrians are arranged at the non-light-controlled pedestrian crossing, different pedestrian crossing probabilities p are arranged for the non-light-controlled pedestrian crossing in consideration of different traffic attraction points at two sides of the road and the space-time characteristics of the traffic of the street pedestrians, and emergency braking is generated with the same probability p when the motor vehicle runs to the non-light-controlled pedestrian crossing; according to the average speed of the motor vehicles obtained in the step 2, different road grades and urban traffic environments are considered, and different maximum speed limits are carried out on the motor vehicles; different motor vehicle densities are set for the roads by considering that different commercial areas and traffic volumes of the urban roads are influenced by the early and late peaks and holidays.
The road traffic flow f is calculated as follows:
wherein rho is the density of the motor vehicle,
n is the number of motor vehicles, L is the road length,
is the average speed of all the vehicles,
viis the speed of the ith vehicle.
In this embodiment, three variable parameters are set: different pedestrian crossing probabilities p are respectively set to be 0, 0.25, 0.5 and 0.75 at the position of the non-light-controlled pedestrian crossing in the bad traffic giving environment, and when the motor vehicle runs to the position of the non-light-controlled pedestrian crossing, emergency braking behaviors are generated with the same probabilities p of 0, 0.25, 0.5 and 0.75; setting the possible maximum speeds of the motor vehicles as 2, 3, 4 and 5 respectively as system speed variable parameters, and calculating the influence of the emergency avoidance behavior of the motor vehicles on road traffic flow under a certain pedestrian crossing probability; when the pedestrian crossing probability is 0.3, the highest speed of the road is 3, and the density is respectively 0.05, 0.1, 0.2, 0.3, 0.5 and 0.7 as system variable parameters.
Preferably, in the step 5, different pedestrian crossing probabilities and different maximum speed limits of motor vehicles are set as variable parameters, and a two-dimensional basic graph with density as a horizontal coordinate and traffic as a vertical coordinate is drawn according to a calculation result; setting different road densities, and drawing a space-time diagram according to the calculation result, wherein the abscissa of the space-time diagram is used for representing the space position, and the ordinate of the space-time diagram is used for representing the time. The meaning of the method is used for indicating the congestion condition of a corresponding road at any time and the congestion change of a certain position in the road at different time, namely reflecting the congestion condition of the road in terms of time and space. And analyzing the traffic flow basic diagram and the road space-time diagram under the corresponding variables through quantitative comparison so as to obtain the conclusion of the influence of the emergency avoidance behavior of the motor vehicle on the traffic flow.
The emergency braking behavior of the motor vehicle at the non-light-controlled pedestrian crossing is analyzed, when the non-light-controlled pedestrian crossing which is courtesy for pedestrian supervision is arranged, the relation between the road traffic environment and the pedestrian crossing demand is comprehensively considered, corresponding traffic advance signs and marked lines are equipped for road users, and reasonable speed limitation is carried out on road sections so as to avoid adverse effects caused when the motor vehicle is subjected to emergency braking.
The embodiments are only for illustrating the technical idea of the present invention, and the technical idea of the present invention is not limited thereto, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the scope of the present invention.
Claims (10)
1. A method for calculating the influence of an emergency avoidance no-lamp control pedestrian crossing of a motor vehicle on traffic flow is characterized by comprising the following steps:
(1) collecting and processing traffic data of motor vehicles passing through a crosswalk without lamp control, wherein the traffic data comprises intersection position coordinates, motor vehicle motion position coordinates, motor vehicle acceleration data and motor vehicle speed data;
(2) quantitatively analyzing the average speed and the acceleration when a motor vehicle driver takes emergency avoidance measures when passing through a pedestrian crosswalk without lamp control;
(3) according to the emergency avoidance characteristics of the motor vehicle, the running speed and displacement of the motor vehicle at the position of the no-lamp control pedestrian crossing during emergency avoidance are calculated in a quantized mode;
(4) according to three variable parameters of different pedestrian crossing probabilities, different motor vehicle maximum speed limits and different motor vehicle densities, motor vehicles take emergency avoidance measures and calculate corresponding road traffic flows;
(5) according to the corresponding traffic flow basic diagram and the road space-time diagram under the three variable parameters, the influence of the emergency avoidance behavior of the motor vehicle on the traffic flow is quantized.
2. The method for calculating the influence of the motor vehicle emergency avoidance light-controlled pedestrian crossing on the traffic flow according to claim 1, wherein in the step (1), the light-controlled pedestrian crossing with the combination of environmental restrictions and traffic supervision measures is selected as a data acquisition point, wherein the environmental restrictions comprise dense pedestrian flow at two sides of roads around the light-controlled pedestrian crossing, dense residential areas, commercial areas and/or schools distributed along the roads, and areas with insufficient sight distance triangles at two ends of the sections of the pedestrian crossing and the light-controlled pedestrian crossing; the traffic supervision measures comprise traffic police on-duty supervision, illegal photographing and citizen photographing reporting.
3. The method for calculating the influence of the motor vehicle on the traffic flow in the emergency avoidance of the pedestrian crosswalk without the lamp control according to claim 1, wherein in the step (1), the data is collected by a method of combining artificial observation and video recording.
4. The method for calculating the influence of the motor vehicle emergency avoidance light-free control pedestrian crossing on the traffic flow according to claim 1, wherein in the step (2), after the operation data of the motor vehicle taking the emergency avoidance measure and passing through the light-free control pedestrian crossing is processed, a corresponding speed curve and an acceleration curve are drawn; obtaining the speed limit on the pedestrian crosswalk without lamp control and the average speed value V which can be reached by the motor vehicle before taking emergency avoidance measures through quantitative analysis of the speed curve; through quantitative analysis of the acceleration curve, the average maximum acceleration a which can be reached by the motor vehicle when an emergency avoidance measure is taken is obtainedmax。
5. The method for calculating the influence of the motor vehicle emergency avoidance crosswalk without lamp control on the traffic flow according to claim 1, wherein in the step (3), the actual road length is divided into a plurality of units with the same interval, the width of the unit is the same as the actual road width, and the length of the unit is used for expressing the length of the motor vehicle; a certain position of the unit is taken as a crosswalk without lamp control, street pedestrians are generated according to the probability p, and motor vehicles near a stop line are identicalProbability p and acceleration amaxGenerating an emergency braking action; each unit has a unique state value at any time, and if there is a vehicle in the current unit, the speed value v of the vehicle is returnednOtherwise the unit returns a value of 0 or Null, velocity value vnThe number of units passed by the motor vehicle per second at the current moment is represented; and adopting a periodic boundary condition and updating the position according to a set time interval.
6. The method for calculating the influence of the motor vehicles on the traffic flow in the emergency avoidance of the pedestrian crosswalk without the lamp control according to claim 5, wherein the pedestrians and the motor vehicles operate according to the following steps:
(a) in unit xnGenerating street-crossing pedestrians with probability p;
(b) setting the random slowing of the motor vehicle to reflect the random deceleration behavior of a driver due to the influence of the environment, and updating the speed of the motor vehicle after the random slowing:
vn+1＝max(vn-1,0)
(c) setting motor vehicle acceleration to show that a driver expects to run at the maximum speed, and updating the speed after acceleration:
vn+1＝min(vn+1,vmax)
(d) detecting the safe distance d between the following vehicle and the front vehiclenAnd performing speed updating:
vn+1＝min(vn,dn)
(e) setting an emergency braking action for the motor vehicle near the pedestrian crossing without lamp control, and updating the speed after the emergency braking:
vn+1＝max(vn-1,0)
(f) and (3) updating the position:
xn+1＝xn+vn
in the above formula, xnIndicating the vehicle position at the current time;
(g) and (c) returning to the step (c) according to a set time interval for circulation.
7. The method for calculating the influence of the motor vehicle on the traffic flow in the emergency avoidance of the pedestrian crosswalk without the lamp control according to claim 5, wherein the periodic boundary conditions are as follows:
after the position is updated for one time, if the updated position does not exceed the length of the road, the motor vehicle continues to run according to the original rule; if the updated position exceeds the road length, the motor vehicle returns to the starting point and becomes a tail vehicle, and the motor vehicle behind the motor vehicle becomes a head vehicle.
8. The method for calculating the influence of the motor vehicle emergency avoidance light-free control pedestrian crossing on the traffic flow according to claim 1, wherein in the step (4), street pedestrians are arranged at the light-free control pedestrian crossing, different pedestrian crossing probabilities p are arranged on the light-free control pedestrian crossing by considering that different traffic attraction points on two sides of the road and the traffic volume of the street pedestrians have space-time characteristics, and emergency braking is generated with the same probability p when the motor vehicle runs to the light-free control pedestrian crossing; according to the average speed of the motor vehicles obtained in the step (2), different road grades and urban traffic environments are considered, and different maximum speed limits are carried out on the motor vehicles; different motor vehicle densities are set for the roads by considering that different commercial areas and traffic volumes of the urban roads are influenced by the early and late peaks and holidays.
9. The method for calculating the influence of the motor vehicle on the traffic flow for the emergency avoidance of the pedestrian crosswalk without lamp control according to claim 1, wherein in the step (4), the road traffic flow f is calculated according to the following formula:
wherein rho is the density of the motor vehicle,
n is the number of motor vehicles, L is the road length,
is the average speed of all the vehicles,
viis the speed of the ith vehicle.
10. The method for calculating the influence of the motor vehicle emergency avoidance crosswalk without the lamp control on the traffic flow according to claim 1, wherein in the step (5), different pedestrian crossing probabilities and different motor vehicle maximum speed limits are set as variable parameters, and a two-dimensional basic graph with density as a horizontal coordinate and traffic volume as a vertical coordinate is drawn according to the calculation result; setting different road densities, and drawing a space-time diagram according to the calculation result, wherein the abscissa of the space-time diagram represents a space position, and the ordinate represents time.
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| CN116416794A (en) * | 2023-03-27 | 2023-07-11 | 东南大学 | Method for judging secondary pedestrian crossing setting condition at crosswalk without signal control |
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