CN113129586B - Plane intersection overall operation evaluation method based on road section speed data - Google Patents
Plane intersection overall operation evaluation method based on road section speed data Download PDFInfo
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Abstract
The invention provides a plane intersection overall operation evaluation method based on road section speed data, which comprises the steps of removing invalid data in different data sets, and screening out plane intersection data; then obtaining an associated data set of the intersection and each entrance road section of the intersection according to an intersection data and road section speed data matching algorithm, converting the speed of each entrance road section of the intersection into a road section congestion index, and identifying a congested entrance road; then calculating the average speed of all the inlet road sections of the intersection, and converting the average speed of the inlet road sections into the average congestion index of the road sections; and finally, establishing an overall operation condition evaluation standard of the plane intersection according to the number of congested entrance roads at the intersection and the average congestion index of the road sections of the entrance roads. The invention fully considers the characteristics of the speed data of the road sections, carries out data association on the intersection and the entrance road sections of the intersection, and obtains the overall operation condition evaluation standard of the plane intersection by analyzing the operation condition of each entrance road section of the intersection.
Description
Technical Field
The invention relates to the field of urban traffic intersection evaluation methods, in particular to a plane intersection overall operation evaluation method based on road section speed data.
Background
Plane intersections are important components of urban road traffic systems, and traffic flows in various directions are orderly collected and separated at the intersections. The importance of the intersection position and the complexity of the traffic operation condition make the intersection become one of important factors restricting the whole road traffic system to fully exert the functional efficiency of the whole road traffic system, so that a special evaluation method and index designed for the plane intersection are the key contents of the research in the field of urban road traffic operation evaluation. In addition, along with the development of intelligent traffic construction, the variety and the quantity of traffic data are increased, and the road section speed data based on the mobile phone navigation map is widely applied to the traffic field due to the advantages of large sample size, high coverage rate, real-time update and the like. Therefore, a method for evaluating the overall operation of the plane intersection based on the road section speed data is needed, the intersection is integrally evaluated based on the road section speed data updated in real time, and the intersection with frequent congestion is identified through the congestion frequency statistics, so that the special treatment and control of the intersection can be performed in a subsequent targeted manner.
At present, the research on the content at home and abroad mainly aims at evaluating a single entrance way of an intersection, and the running condition of the whole intersection cannot be systematically mastered; in addition, related studies have not considered a scenario in which link speed data is applied to intersection operation evaluation.
Disclosure of Invention
The invention provides a plane intersection overall operation evaluation method based on road section speed data, and provides a calculation method which is smaller in calculation complexity, can be updated in real time and is more reasonable for plane intersection evaluation.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a plane intersection overall operation evaluation method based on road section speed data comprises the following steps:
s1: acquiring a road section speed data set and an intersection data set in a research area and a research time period;
s2: preprocessing a road section speed data set and an intersection data set, wherein the preprocessing comprises invalid data cleaning and plane intersection screening;
s3: determining the range of the plane intersection according to the intersection correlation standard, and matching intersection data with road speed data to obtain an intersection and each entrance road section correlation data set thereof;
s4: converting the speed of each inlet road section of the intersection into a road section congestion index, and identifying the congestion inlet road of the intersection;
s5: calculating the average speed of all the inlet road sections of the intersection, and converting the average speed of the inlet road sections into average congestion indexes of the road sections;
s6: and establishing an overall operation condition evaluation standard of the plane intersection based on the number of congestion entrance roads at the intersection and the average congestion index of the road sections of the entrance roads.
Further, in step S1, the link speed data of the research area and the research time period includes: (1) road section number roadid: unique identification of the road section; (2) road section name roadname: the name of the road segment; (3) length: the length of the road segment; (4) maximum number of lanes maxlanes: the number of lanes of the road section; (5) update time updatetime: the time of generation of the data record; (6) speed: speed of the road segment; (7) geographic range geo: geographic location information of the road segment; (8) direction orientation: the driving direction of the road section; intersection data in the study area and the study period include: (1) intersection number crossid: unique identification of the intersection; (2) intersection name crossname cross: the name of the intersection; (3) longitude lon: longitude of the position of the intersection; (4) latitude lat: the latitude of the position of the intersection; (5) intersection type crosstype: the type of the intersection.
Further, in the step S2, the invalid data refers to position abnormality data, that is, longitude and latitude of the intersection or road section speed data are not within the research range; the field missing data is data with missing fields, such as update time, speed, direction and the like of the road section speed data; the speed abnormality data is link data in which the speed field of the link speed data has data but the speed values of the data are all 0.
Further, in step S2, the plane intersection screening means selecting plane intersection data according to an intersection type field of the intersection data to perform calculation, and eliminating data other than the intersection type.
Further, in step S3, it is determined that the plane intersection range is 150 meters according to the intersection related criteria, and the specific process of matching the intersection data with the road segment speed data is as follows:
s31: unifying the spatial coordinate systems adopted by the intersection data and the road section speed data;
s32: identifying a road segment geographical location endpoint for the road segment speed data;
s33: matching the intersection position data with the road section endpoint data by using a shortest distance method to obtain an intersection approaching road section;
s34: judging whether the road section is an intersection entrance road or not according to the driving direction information of the road section close to the intersection, judging whether the length of the road section is more than 150 meters or not if the road section is the entrance road, correlating the upstream road section of the road section if the length of the road section is less than 150 meters, and so on until the total length of the correlated road section exceeds 150 meters, namely completing matching, and obtaining that the number of the entrance road sections of the intersection is more than or equal to 1.
Further, in the step S4, the speed of each entrance road segment at the intersection is converted into a road segment congestion index according to the urban traffic operation condition evaluation specification, and the congestion entrance road at the intersection is identified, where the congestion entrance road indicates that the operation conditions of all road segments of a certain entrance road at the intersection are heavily congested.
Further, in step S5, the step of calculating the average value of the speeds of all the entrance road segments at the intersection is to perform weighted average on the speeds of all the entrance road segments, the weight mainly takes into account the length and the number of lanes of each entrance road segment at the intersection, and the calculation formula is as follows:
in the formula (I), the compound is shown in the specification,
is the average speed, v, of all the road sections of the approach at a certain intersectioniFor the speed of the entry road section i,/iIs the length of the entry road section i, ciThe number of the lanes of the entrance road section i is n, and the total number of all the entrance roads at a certain intersection is n.
Further, in step S6, the evaluation criterion of the overall operation condition of the planar intersection is established according to the number of congested entrance roads at the intersection and the average congestion index of the entrance road sections, and the evaluation criterion is as follows: if the intersection has no congestion entrance road and the average congestion index of the entrance road section is lower, judging that the running condition of the intersection is smooth; if the intersection has no congestion entrance lane but the average congestion index of the entrance lane section is higher, the intersection is judged to be basically smooth in operation condition; if the intersection has a congested entrance road but the average congestion index of the section of the entrance road is lower, judging that the operation condition of the intersection is local congestion; and if the intersection has a congested entrance road and the average congestion index of the entrance road section is higher, judging that the operation condition of the intersection is serious congestion.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention fully considers the characteristics of the speed data of the road sections, carries out data association on the intersection and the entrance road sections of the intersection, obtains the overall operation condition evaluation standard of the plane intersection by analyzing the operation condition of each entrance road section of the intersection, and has small calculation complexity and stronger timeliness of the evaluation method.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
fig. 2 is an exemplary schematic view of an intersection approach road segment.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, a method for evaluating the overall operation of a plane intersection based on road section speed data includes the following steps:
s1: acquiring a road section speed data set and an intersection data set in a research area and a research time period;
s2: preprocessing a road section speed data set and an intersection data set, wherein the preprocessing comprises invalid data cleaning and plane intersection screening;
s3: determining the range of the plane intersection according to the intersection correlation standard, and matching intersection data with road speed data to obtain an intersection and each entrance road section correlation data set thereof;
s4: converting the speed of each inlet road section of the intersection into a road section congestion index, and identifying the congestion inlet road of the intersection;
s5: calculating the average speed of all the inlet road sections of the intersection, and converting the average speed of the inlet road sections into average congestion indexes of the road sections;
s6: and establishing an overall operation condition evaluation standard of the plane intersection based on the number of congestion entrance roads at the intersection and the average congestion index of the road sections of the entrance roads.
The above-described steps will be described in detail below.
First, it is necessary to acquire road section speed data and intersection data in a research area such as a prefecture-level administrative district or a county-level administrative district for a research period.
Secondly, preprocessing the road section speed data and the intersection data:
a) deleting data of which the longitude and latitude coordinates are not in the research area; deleting data with field information being null value or invalid value; deleting the road section data of which the speed fields of the road section speed data have data but the speed values of the data are all 0;
b) and selecting plane intersection data for calculation according to the intersection type field of the intersection data, and removing data except the intersection type.
And then, determining the range of the plane intersection according to the intersection correlation standard, and matching the intersection data with the road speed data to obtain an intersection and each entrance road section correlation data set.
And in the plane intersection range, referring to the intersection service level recommended by municipal design institute in Beijing, when the average red light blocking length of an entrance road is more than or equal to 150 meters, the entrance is in a blocking state, and based on the blocking state, the intersection range is selected to be 150 meters for evaluating the running condition of the intersection.
The concrete process of matching the intersection data and the road section speed data is as follows:
a) unifying the spatial coordinate systems adopted by the intersection data and the road section speed data;
b) identifying a road segment geographical location endpoint for the road segment speed data;
c) matching the intersection position data with the road section endpoint data by using a shortest distance method to obtain an intersection approaching road section;
d) judging whether the road section is an intersection entrance road or not according to the driving direction information of the road section adjacent to the intersection, judging whether the length of the road section is more than 150 meters or not if the road section is the entrance road, associating the upstream road section of the road section if the length of the road section is less than 150 meters, and repeating the steps until the total length of the associated road section exceeds 150 meters, completing matching, and obtaining an associated data set of the intersection and each entrance road section of the intersection, wherein the number of each entrance road section of the intersection is more than or equal to 1, and the data set is specifically shown in fig. 2.
And then, converting the speed of each entrance road section of the intersection into a road section congestion index, and identifying the congestion entrance road of the intersection. The road section congestion index can directly reflect the running condition of the road section and has a direct relation with the speed, the road section congestion condition can be judged according to the percentage of the speed of the road section at the entrance of the intersection and the speed of the free flow, and the calculation formula is as follows:
wherein k isiIs the percentage of the speed of the inlet road section i to the free flow speed, viAs is the speed of the entrance road segment i,
and taking the speed values of 6:00-24:00 per day in 60 days of historical data of the road section as the free flow speed of the entrance road section i, sorting the speed values from large to small, and averaging the top 1/9 of the sorting result to obtain the free flow speed of the road section.
Percentage k of speed of the entry road section and of the free flow speediThe corresponding relation with the road section congestion index is shown in the table 1, and the judgment standard refers to 'urban traffic running condition evaluation specification GB/T33171-2016'.
TABLE 1 road segment congestion index grade division table
| Road segment congestion index | Road section operating conditions | Percentage of velocity to free stream velocity |
| 1 | Clear | 70％ |
| 2 | Is basically unblocked | 50％-70％ |
| 3 | Light congestion | 40％-50％ |
| 4 | Moderate congestion | 30％-40％ |
| 5 | Severe congestion | <30％ |
And identifying the congestion entrance road of the intersection through the congestion indexes of all the road sections of the entrance road of the intersection, wherein if the congestion indexes of all the road sections of a certain entrance road of the intersection are all 5, namely serious congestion occurs, the entrance road is the congestion entrance road.
Then, calculating the average value of all the speeds of the inlet road sections of the intersection is to perform weighted average on the speeds of all the inlet road sections, wherein the weight mainly considers the length and the number of lanes of all the inlet road sections of the intersection, and the calculation formula is as follows:
in the formula (I), the compound is shown in the specification,
is the average speed, v, of all the road sections of the approach at a certain intersectioniFor the speed of the entry road section i,/iIs the length of the entry road section i, ciThe number of the lanes of the entrance road section i is n, and the total number of all the entrance roads at a certain intersection is n.
And similarly, converting the average speed of the road section of the inlet road of the intersection into the average congestion index of the road section of the inlet road by adopting a method of converting the speed of each road section of the inlet road of the intersection into the congestion index of the road section.
And finally, establishing an overall operation condition evaluation standard of the plane intersection according to the number of congestion entrance roads at the intersection and the average congestion index of the road sections of the entrance roads, wherein the evaluation standard is as follows: if the intersection has no congestion entrance road and the average congestion index of the entrance road section is lower, judging that the running condition of the intersection is smooth; if the intersection has no congestion entrance lane but the average congestion index of the entrance lane section is higher, the intersection is judged to be basically smooth in operation condition; if the intersection has a congested entrance road but the average congestion index of the section of the entrance road is lower, judging that the operation condition of the intersection is local congestion; and if the intersection has a congested entrance road and the average congestion index of the section of the entrance road is higher, judging that the operation condition of the intersection is serious congestion. The intersection overall operation condition grade division table is shown in table 2.
TABLE 2 integral running state grade division table for intersections
The same or similar reference numerals correspond to the same or similar parts;
the positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (5)
1. A plane intersection overall operation evaluation method based on road section speed data is characterized by comprising the following steps:
s1: acquiring a road section speed data set and an intersection data set in a research area and a research time period;
s2: preprocessing a road section speed data set and an intersection data set, wherein the preprocessing comprises invalid data cleaning and plane intersection screening;
s3: determining the range of the plane intersection according to the intersection correlation standard, and matching intersection data with road speed data to obtain an intersection and each entrance road section correlation data set thereof;
s4: converting the speed of each inlet road section of the intersection into a road section congestion index, and identifying the congestion inlet road of the intersection;
s5: calculating the average speed of all the inlet road sections of the intersection, and converting the average speed of the inlet road sections into the average congestion index of the road sections;
s6: establishing an overall operation condition evaluation standard of the plane intersection based on the number of congestion entrance roads at the intersection and the average congestion index of the road sections of the entrance roads;
in step S3, the planar intersection range is determined to be 150 meters according to the intersection related criteria, and the specific process of matching the intersection data with the road section speed data is as follows:
s31: unifying the spatial coordinate systems adopted by the intersection data and the road section speed data;
s32: identifying a road segment geographical location endpoint for the road segment speed data;
s33: matching the intersection position data with the road section endpoint data by using a shortest distance method to obtain an intersection adjacent road section;
s34: judging whether the road section is an intersection entrance road or not according to the driving direction information of the road section adjacent to the intersection, judging whether the length of the road section is more than 150 meters or not if the road section is the entrance road, and associating the upstream road section of the road section if the length of the road section is less than 150 meters until the total length of the associated road section exceeds 150 meters, namely completing matching and obtaining that the number of each entrance road section of the intersection is more than or equal to 1;
in the step S4, the speed of each entrance road section at the intersection is converted into a road section congestion index according to the urban traffic operation condition evaluation specification, and an intersection congestion entrance road is identified, where the congestion entrance road refers to an intersection where all the road sections of an entrance road have severe congestion;
in step S5, the step of calculating the average value of the speeds of all the entrance road segments at the intersection is to perform weighted average on the speeds of all the entrance road segments, the weight mainly takes into account the length and the number of lanes of each entrance road segment at the intersection, and the calculation formula is as follows:
in the formula (I), the compound is shown in the specification,
average speed, v, of all the road sections of the approach at a given intersectioniFor the speed of the entry road section i,/iIs the length of the entry road section i, ciThe number of the lanes of the entrance road section i is n, and the total number of all the entrance roads at a certain intersection is n;
in step S6, the evaluation criterion of the overall operation condition of the plane intersection is established according to the number of congestion entrance lanes at the intersection and the average congestion index of the entrance lane section, and the evaluation criterion is as follows: if the intersection has no congestion entrance road and the average congestion index of the road section of the entrance road is lower, judging that the running condition of the intersection is smooth; if the intersection has no congestion entrance lane but the average congestion index of the entrance lane section is higher, the intersection is judged to be basically smooth in operation condition; if the intersection has a congested entrance road but the average congestion index of the entrance road section is lower, judging that the operation condition of the intersection is local congestion; and if the intersection has a congested entrance road and the average congestion index of the entrance road section is higher, judging that the operation condition of the intersection is serious congestion.
2. The method for evaluating the overall operation of a plane intersection based on the link speed data according to claim 1, wherein in step S1, the link speed data in the research area and the research time period includes: (1) road section number roadid: unique identification of the road section; (2) road section name roadname: the name of the road segment; (3) length: the length of the road segment; (4) maximum number of lanes maxlanes: the number of lanes of the road section; (5) update time updatetime: the time of generation of the data record; (6) speed: speed of the road segment; (7) geographic range geo: geographic location information of the road segment; (8) direction orientation: the driving direction of the road section.
3. The method for evaluating the overall operation of a plane intersection based on the link speed data according to claim 2, wherein in the step S1, the intersection data of the research area and the research time period includes: (1) intersection number crossid: unique identification of the intersection; (2) intersection name crossname cross: the name of the intersection; (3) longitude lon: longitude of the position of the intersection; (4) latitude lat: the latitude of the position of the intersection; (5) intersection type crosstype: the type of the intersection.
4. The method for evaluating the overall operation of the plane intersection based on the road section speed data as claimed in claim 3, wherein in the step S2, the invalid data refers to position abnormal data, that is, the longitude and latitude of the intersection or the road section speed data are not in the research range; field missing data, namely data with missing fields of updating time, speed and direction of the road section speed data; the speed abnormality data is link data in which the speed field of the link speed data has data but the speed values of the data are all 0.
5. The method for evaluating the overall operation of the plane intersection based on the road section speed data as claimed in claim 4, wherein in the step S2, the plane intersection screening means that plane intersection data are selected according to an intersection type field of the intersection data for calculation, and data except the intersection type are removed.
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