CN113192320B - Open type community road traffic improvement condition analysis method - Google Patents
Open type community road traffic improvement condition analysis method Download PDFInfo
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- CN113192320B CN113192320B CN202110281093.XA CN202110281093A CN113192320B CN 113192320 B CN113192320 B CN 113192320B CN 202110281093 A CN202110281093 A CN 202110281093A CN 113192320 B CN113192320 B CN 113192320B
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- G08G1/01—Detecting movement of traffic to be counted or controlled
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Abstract
The invention discloses an open type community road traffic improvement condition analysis method, which comprises the following steps: step (1), constructing a community road network; step (2)) The total time taken by the vehicle to pass through the road network of the cell includes the sum T of the time taken by the vehicle to pass through the road area around the cell1And the sum of the time T of the vehicle passing through the road area inside the cell2(ii) a Total time T for vehicles to pass through road network of residential area before residential area is openedall′＝T1Total time T for vehicles to pass through road network of residential area after residential area is openedall＝T1+T2(ii) a Step (3) calculating C in step (2)ijAnd tij(ii) a Step (4), establishing an optimal distribution model of the traffic flow system according to the system optimal principle; step (5) according to step (3) and step (4), finding TallAnd T'allAnd establishing a community road network traffic improvement rate calculation model by taking the improvement rate eta of the time spent by vehicles passing through the community road network after the community is opened as the traffic improvement rate of the opened community to the community road network. The method can accurately analyze the influence of the opening of the community on the traffic of the surrounding roads.
Description
Technical Field
The invention relates to the technical field of urban road traffic, in particular to an open type community road traffic improvement condition analysis method.
Background
The open type community is characterized in that one or more roads in the closed type community are connected with an external municipal road for vehicles or pedestrians under the condition of ensuring normal operation conditions of accommodation, office work, rest, education and the like in the community. Whether the open cell can achieve the purposes of optimizing a road network structure, improving road traffic capacity and improving traffic conditions and how to improve the effect is always the key point of concern on the problems of whether the cell is open or not and the like, so the evaluation and analysis technology related to the cell opening has higher practical research value.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an open type cell road traffic improvement condition analysis method.
The invention adopts the following technical scheme for solving the technical problems:
the invention provides an open type community road traffic improvement condition analysis method, which comprises the following steps:
step (1), constructing a community road network;
step (2), selecting the total time of the vehicles passing through the road network of the cell as a traffic condition operation index, wherein the total time comprises the sum T of the time of the vehicles passing through the road area around the cell1And the sum of the time T of the vehicle passing through the road area inside the cell2Two parts; total time T for vehicles to pass through road network of residential area before residential area is openedall′＝T1Total time T for vehicles to pass through road network of residential area after residential area is openedall＝T1+T2According to the traffic capacity C of the jth section of the ith area in the community road networkijAnd the vehicle running time t of the jth road section of the ith area in the community road networkijObtaining T1And T2(ii) a Wherein i is 1, 2; when i is 1, the 1 st area means a road area around the cell, when i is 2, the 2 nd area means a road area inside the cell, and j is 1,2 … biJ represents a link number included in the cell road network, biIndicating the number of segments of the ith area;
step (3) for C in step (2)ijAnd tijSequentially calculating;
Cijthe calculation formula of (a) is as follows:
wherein v isijThe driving speed of a vehicle in the jth section of the ith area in the community road network is represented, l represents the minimum distance between the heads of the vehicles, and t is the reaction time of a driver;
tijthe calculation formula of (a) is as follows:
wherein L isijRepresenting the travel distance of the vehicle on the jth road section of the ith area in the cell road network;
step (4), establishing an optimal distribution model of the traffic flow system according to the optimal principle of the system, wherein the model is described in detail as follows:
wherein z (Q) represents the total travel time of all vehicles passing through the cell road network when the set of arguments in formula (3) is Q, QijThe traffic volume of the jth road section of the ith area in the community road network; t is tij(qij) Is tijIs about qijA function of (a); p is a radical ofrsFor the traffic demand between the r-th node to the s-th node in the cell road network,
the traffic flow from the r node to the h path in the s node in the cell road network;
the correlation coefficient between the jth road section of the ith area in the community road network and the ith path from the r node to the s node in the community road network is obtained; if the jth section of the ith area in the community road network is on the ith path from the r node to the s node in the community road network, then
Otherwise
KrsCollecting all paths from the r node to the s node in the cell road network;
step (5) according toStep (3) and step (4) of obtaining TallAnd T'allAnd establishing a community road network traffic improvement rate calculation model by taking the improvement rate eta of the time spent by vehicles passing through the community road network after the community is opened as the traffic improvement rate of the opened community to the community road network:
when eta is less than 0, the traffic condition of the cell road network is poor after the cell is opened, when eta is 0, the traffic condition of the cell road network is not changed after the cell is opened, and when eta is more than 0, the traffic condition of the cell road network is improved, and the improvement rate is eta.
As a further optimization scheme of the open cell road traffic improvement condition analysis method, a cell road network is defined as a set G ═ (V, E, W), where the set V ═ V is set1,v2…,vpDenotes a set of nodes, vrDenotes the r-th node, r 1,2 …, p, p denotes the total number of nodes, and E { E ═ E }1,e2,…,emDenotes a section of a road between each adjacent node of the cell, eyDenotes the y-th link, y is 1,2 …, m denotes the total number of links, and the adjacency matrix W is (W)rs)p×p，(wrs)p×pA matrix representing a neighborhood relationship between an r-th node to an s-th node among the p nodes; w is arsRepresenting the adjacent relation between the r node and the s node, wherein r belongs to p, s belongs to p, when there is a road section between the r node and the s node, wrsIs equal to the travel time of the vehicle between the r node and the s node, and when no road section exists between the r node and the s node, wrsEqual to 0 or ∞.
The further optimization scheme of the open type community road traffic improvement condition analysis method is that in the step (2), T1The calculation formula of (2) is as follows:
T2the calculation formula of (2) is as follows:
wherein the non-motor vehicle influence factor
As a further optimization scheme of the open type community road traffic improvement condition analysis method, in the step (3), the parameter relation among the traffic flow, the driving speed and the traffic flow density is analyzed, and the driving speed v of the vehicle on the jth road section of the ith area in the community road network is analyzedijAnd (3) calculating:
in the formula, P1Indicating the number of exits between a road and a cell affecting a speed parameter, kijRepresenting the average density of vehicles in the ith area and the jth road section in the cell road network; p2Corrected speed parameter, P, representing the number of lanes of the road surrounding the cell3A speed influencing parameter representing the number of occupied lanes inside the cell.
As a further optimization scheme of the open cell road traffic improvement condition analysis method, in the step (4), based on the cell structure characteristics, a constraint is further set for a traffic flow distribution model, and the method comprises the following steps:
step (4.1), setting capacity limiting conditions for each road section (v)r,vs) E is in E, q is more than or equal to 0rsR is less than or equal to, wherein q isrsFor the r-th node v in the road network of the cellrTo the s-th node vsRoad section (v)r,vs) The upper traffic flow R represents the capacity of the road;
and (4.2) setting a traffic flow balance condition, and meeting the requirement that the inflow is equal to the outflow for the intersection nodes of the cell road network, namely meeting the requirement that each intersection node:
the vehicle enters the area of the cell and v isrAs cell entrance, v issAs cell egress, then for vrThere is:
for outlet vrExistence of
Wherein v (q) is denoted by vrActual net vehicle flow.
As a further optimization scheme of the open type community road traffic improvement condition analysis method, points and lines are respectively adopted to represent road nodes and road sections of a community, and the connection relation between the road nodes and the road sections is stored by adopting an adjacent matrix to construct a community road network.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
the method can quantitatively evaluate and analyze the improvement condition of road traffic after the community is opened, and is suitable for the open community with any structural characteristics.
Drawings
Fig. 1 is a flowchart of an open cell road traffic improvement analysis technique.
Fig. 2 is a plan view of a cellular road network.
Fig. 3 is a connection relationship between a network node and a road segment of a cell road network.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
an open type community peripheral road traffic improvement condition analysis technology comprises the following steps: A. constructing a community traffic network and carrying out community structure analysis; B. determining traffic condition operation indexes of roads around a cell; C. analyzing the internal relation of the traffic operation condition indexes of roads around the community; D. traffic flow distribution based on cell heterogeneity architecture; E. establishing a traffic improvement rate calculation model of roads around a cell; F. and analyzing the traffic improvement condition of the surrounding roads after the community is opened.
The invention provides an open type analysis technology for improving the traffic condition of roads around a community, which is used for quantitatively evaluating and analyzing the influence of community opening on the traffic of the roads around the community and providing an analysis technology for evaluating the influence condition of the community opening on the traffic of the roads.
In the embodiment, a certain cell in the southeast of China is selected as a test object, the number of the entrances and exits of the cell is 3, the peripheral roads are two lanes, and the length and the width of the cell are 180m and 150m respectively.
The invention will be further elucidated with reference to the drawings in which:
as shown in fig. 1, an analysis technique for traffic improvement around an open cell includes the following steps:
and (1) respectively representing road nodes and road sections of the residential quarter by using points and lines, and storing the connection relation of the road nodes and the road sections by using an adjacent matrix to construct a residential quarter road network.
In the embodiment, a certain cell is selected as a test object, a cell plan is obtained based on a Baidu map, the number of entrances and exits of the cell is 3, surrounding roads are two lanes, and the length and the width of the cell are 180m and 150m respectively. As shown in fig. 2, the road nodes and road segments in the cell are represented by points and lines, respectively, and the cell road network is defined as a set G ═ (V, E, W), where the set V ═ V, respectively1,v2…,vpDenotes a set of nodes, vrDenotes the r-th node, r 1,2 …, p, p denotes the total number of nodes, and E { E ═ E }1,e2,…,emDenotes a section of a road between each adjacent node of the cell, eyIndicates the y-th roadSegment, y is 1,2 …, m denotes the total number of links, and the adjacency matrix W is (W)rs)p×p，(wrs)p×pA matrix representing the neighborhood relationship between the r-th node to the s-th node of the p nodes, wrsRepresenting the adjacent relation between the r node and the s node, wherein r belongs to p, s belongs to p, when there is a road section between the r node and the s node, wrsIs equal to the travel time of the vehicle between the r node and the s node, and when no road section exists between the r node and the s node, wrsEqual to 0 or ∞. Constructing a traffic network, as shown in fig. 3, storing the connection relationship between nodes and road sections in a cell in an adjacency matrix:
the rows and the columns represent road nodes, each element represents a connecting road section between the road nodes, the specific numerical value of each element represents the road connectivity, and when the value of each element is 0, no road section connectivity exists between the two road nodes.
Selecting the total time of the vehicles passing through the road network of the cell as a traffic condition operation index, wherein the total time comprises the sum T of the time of the vehicles passing through the road area around the cell1And the sum of the time T of the vehicle passing through the road area inside the cell2Two parts; total time T for vehicles to pass through road network of residential area before residential area is openedall′＝T1Total time T for vehicles to pass through road network of residential area after residential area is openedall＝T1+T2According to the traffic capacity C of the jth section of the ith area in the community road networkijAnd the vehicle running time t of the jth road section of the ith area in the community road networkijObtaining T1And T2(ii) a Wherein i is 1, 2; when i is 1, the 1 st area means a road area around the cell, when i is 2, the 2 nd area means a road area inside the cell, and j is 1,2 … biJ represents a link number included in the cell road network, biIndicating the number of segments of the ith area;
referring to the definition of road resistance proposed in FHWA in USA, the time sum T of the vehicle passing through the road around the cell is obtained1The calculation formula of (2) is as follows:
T2the calculation formula of (2) is as follows:
wherein the non-motor vehicle influence factor
In the embodiment, the total time of the vehicle passing through the district road network is selected as the traffic condition operation index, and the total time comprises two parts of the time sum of the vehicle passing through the road areas around the district and the time sum of the vehicle passing through the road areas inside the district.
Step (3) for C in step (2)ijAnd tijSequentially calculating;
Cijthe calculation formula of (a) is as follows:
wherein v isijThe driving speed of a vehicle in the jth section of the ith area in the community road network is represented, l represents the minimum distance between the heads of the vehicles, and t is the reaction time of a driver;
tijthe calculation formula of (a) is as follows:
wherein L isijRepresenting the travel distance of the vehicle on the jth road section of the ith area in the cell road network;
analyzing the parameter relation of the traffic flow, the driving speed and the traffic flow density, and carrying out analysis on the driving speed v of the vehicle on the jth road section of the ith area in the community road networkijAnd (3) calculating:
in the formula, P1Indicating the number of exits between a road and a cell affecting a speed parameter, kijRepresenting the average density of vehicles in the ith area and the jth road section in the cell road network; p2Corrected speed parameter, P, representing the number of lanes of the road surrounding the cell3A speed influencing parameter representing the number of occupied lanes inside the cell.
In this embodiment, step (4) is to establish an optimal distribution model of the traffic flow system according to the system optimal principle, and the model is specifically described as follows:
wherein z (Q) represents the total travel time of all vehicles passing through the cell road network when the set of arguments in formula (3) is Q, QijThe traffic volume of the jth road section of the ith area in the community road network; t is tijThe vehicle driving time is the vehicle driving time on the jth road segment of the ith area of the cell road network; t is tij(qij) Is tijIs about qijA function of (a); p is a radical ofrsFor the traffic demand between the r-th node to the s-th node in the cell road network,
the traffic flow from the r node to the h path in the s node in the cell road network;
the jth road section of the ith area in the community road network and the h node from the r node to the s node in the community road networkA correlation coefficient between the paths; if the jth section of the ith area in the community road network is on the ith path from the r node to the s node in the community road network, then
Otherwise
KrsCollecting all paths from the r node to the s node in the cell road network;
based on the cell structure characteristics, further setting constraints for the traffic flow distribution model, comprising the following steps:
step (4.1), setting capacity limiting conditions for each road section (v)r,vs) E is in E, q is more than or equal to 0rsR is less than or equal to, wherein q isrsFor the r-th node v in the road network of the cellrTo the s-th node vsRoad section (v)r,vs) The upper traffic flow R represents the capacity of the road;
and (4.2) setting a traffic flow balance condition, and meeting the requirement that the inflow is equal to the outflow for the intersection nodes of the cell road network, namely meeting the requirement that each intersection node:
the vehicle enters the area of the cell and v isrAs cell entrance, v issAs cell egress, then for vrThere is:
for outlet vrExistence of
In the formula, v (q) is calledIs v isrActual net vehicle flow.
As shown in fig. 3, the vehicles are driven from v before the cell is opened1To v8The average time consumed was 82 s. After the cell was opened, 33.45% of the vehicles selected to pass through the cell interior. Can derive T1Equal to 32.98s, T2Equal to 28.11 s.
And (5): taking the improvement rate eta of the time spent by vehicles passing through the community road network after the community is opened as the traffic improvement rate of the open community to the community road network, and establishing a community road network traffic improvement rate calculation model:
when eta is less than 0, the traffic condition of the cell road network is poor after the cell is opened, when eta is 0, the traffic condition of the cell road network is not changed after the cell is opened, and when eta is more than 0, the traffic condition of the cell road network is improved, and the improvement rate is eta. T isa'll＝82s，Tall61.09s, 25.5%. According to the calculation result of the improvement rate, after the cell is opened, the traffic condition of the road network of the example cell is improved, and the specific improvement rate eta is 25.5%.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (5)
1. An open cell road traffic improvement condition analysis method is characterized by comprising the following steps:
step (1), constructing a community road network;
step (2), selecting the total time of the vehicles passing through the road network of the cell as a traffic condition operation index, wherein the total time comprises the sum T of the time of the vehicles passing through the road area around the cell1And the sum of the time T of the vehicle passing through the road area inside the cell2Two parts; total time T for vehicles to pass through road network of residential area before residential area is openedall′＝T1Total time T for vehicles to pass through road network of residential area after residential area is openedall＝T1+T2According to the traffic capacity C of the jth section of the ith area in the community road networkijAnd the vehicle running time t of the jth road section of the ith area in the community road networkijObtaining T1And T2(ii) a Wherein i is 1, 2; when i is 1, the 1 st area means a road area around the cell, when i is 2, the 2 nd area means a road area inside the cell, and j is 1,2 … biJ represents a link number included in the cell road network, biIndicating the number of segments of the ith area;
step (3) for C in step (2)ijAnd tijSequentially calculating;
Cijthe calculation formula of (a) is as follows:
wherein v isijThe driving speed of a vehicle in the jth section of the ith area in the community road network is represented, l represents the minimum distance between the heads of the vehicles, and t is the reaction time of a driver;
tijthe calculation formula of (a) is as follows:
wherein L isijRepresenting the travel distance of the vehicle on the jth road section of the ith area in the cell road network;
step (4), establishing an optimal distribution model of the traffic flow system according to the optimal principle of the system, wherein the model is described in detail as follows:
wherein z (Q) represents the total travel time of all vehicles passing through the cell road network when the set of arguments in formula (3) is Q, QijThe traffic volume of the jth road section of the ith area in the community road network; t is tij(qij) Is tijIs about qijA function of (a); p is a radical ofrsFor the traffic demand between the r-th node to the s-th node in the cell road network,
the traffic flow from the r node to the h path in the s node in the cell road network;
the correlation coefficient between the jth road section of the ith area in the community road network and the ith path from the r node to the s node in the community road network is obtained; if the jth section of the ith area in the community road network is on the ith path from the r node to the s node in the community road network, then
Otherwise
KrsCollecting all paths from the r node to the s node in the cell road network;
step (5) of obtaining T according to the step (3) and the step (4)allAnd T'allAnd establishing a community road network traffic improvement rate calculation model by taking the improvement rate eta of the time spent by vehicles passing through the community road network after the community is opened as the traffic improvement rate of the opened community to the community road network:
when eta is less than 0, the traffic condition of the cell road network is poor after the cell is opened, when eta is 0, the traffic condition of the cell road network is not changed after the cell is opened, and when eta is more than 0, the traffic condition of the cell road network is improved after the cell is opened, and the improvement rate is eta;
in step (2), T1The calculation formula of (2) is as follows:
T2the calculation formula of (2) is as follows:
wherein the non-motor vehicle influence factor
2. The method as claimed in claim 1, wherein the cellular road network is defined as a set G ═ (V, E, W), where the set V ═ V —, in1,v2…,vpDenotes a set of nodes, vrDenotes the r-th node, r 1,2 …, p, p denotes the total number of nodes, and E { E ═ E }1,e2,…,emDenotes a section of a road between each adjacent node of the cell, eyDenotes the y-th link, y is 1,2 …, m denotes the total number of links, and the adjacency matrix W is (W)rs)p×p，(wrs)p×pA matrix representing a neighborhood relationship between an r-th node to an s-th node among the p nodes; w is arsRepresenting the adjacent relation between the r node and the s node, wherein r belongs to p, s belongs to p, when there is a road section between the r node and the s node, wrsIs equal to the travel time of the vehicle between the r node and the s node, and when no road section exists between the r node and the s node, wrsEqual to 0 or ∞.
3. The method of claim 1, wherein the method comprises: in the step (3), the parameter relation of the traffic flow, the driving speed and the traffic flow density is analyzed, and the driving speed v of the vehicle on the jth road section of the ith area in the community road network is measuredijAnd (3) calculating:
in the formula, P1Indicating the number of exits between a road and a cell affecting a speed parameter, kijRepresenting the average density of vehicles in the ith area and the jth road section in the cell road network; p2Corrected speed parameter, P, representing the number of lanes of the road surrounding the cell3A speed influencing parameter representing the number of occupied lanes inside the cell.
4. The method of claim 1, wherein the method comprises: in the step (4), based on the cell structure characteristics, further setting constraints for the traffic flow distribution model, including the following steps:
step (4.1), setting capacity limiting conditions for each road section (v)r,vs) E is in E, q is more than or equal to 0rsR is less than or equal to, wherein q isrsFor the r-th node v in the road network of the cellrTo the s-th node vsRoad section (v)r,vs) The upper traffic flow R represents the capacity of the road;
and (4.2) setting a traffic flow balance condition, and meeting the requirement that the inflow is equal to the outflow for the intersection nodes of the cell road network, namely meeting the requirement that each intersection node:
the vehicle enters the area of the cell and v isrAs cell entrance, v issAs cell exit, thenvrThere is:
for outlet vrExistence of
Wherein v (q) is denoted by vrActual net vehicle flow.
5. The method as claimed in claim 1, wherein in step (1), the points and lines are used to represent road nodes and road segments of the cell, respectively, and the adjacency matrix is used to store the connection relationship between the road nodes and the road segments, so as to construct the cell road network.
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| CN110414067A (en) * | 2019-07-01 | 2019-11-05 | 东南大学 | A method of considering that the cell inside and outside road of traffic safety is connected design |
| CN112016213A (en) * | 2020-08-31 | 2020-12-01 | 哈尔滨工业大学 | Closed cell opening decision method considering environmental influence |
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| CN108108899A (en) * | 2017-12-22 | 2018-06-01 | 南京信息工程大学 | The evaluation model influenced based on open route in cell on peripheral path |
| CN108446490A (en) * | 2018-03-19 | 2018-08-24 | 辽宁石油化工大学 | A kind of open cell formula road optimum design method |
| CN109308559A (en) * | 2018-03-20 | 2019-02-05 | 昆明理工大学 | A kind of open evaluation method of the closed type through cutting road based on Monte Carlo EGS4 method |
| CN110414067A (en) * | 2019-07-01 | 2019-11-05 | 东南大学 | A method of considering that the cell inside and outside road of traffic safety is connected design |
| CN112016213A (en) * | 2020-08-31 | 2020-12-01 | 哈尔滨工业大学 | Closed cell opening decision method considering environmental influence |
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