CN103077279B - A kind of evaluation methodology of safety level in plane intersection under urban traffic environment - Google Patents
A kind of evaluation methodology of safety level in plane intersection under urban traffic environment Download PDFInfo
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Abstract
The invention discloses the evaluation methodology of a kind of urban traffic environment lower plane crossing safety, gathered by field data, micro-simulation simulator PARAMICS is used to set up the PARAMICS simulation model of microscopic of urban traffic environment lower plane crossing, phantom is carried out parameter calibration, change emulation random seed, repeatedly Dynamic simulation, Output simulation track of vehicle file, use conflict analysis software SSAM that emulation vehicle trail file is analyzed, output all kinds such as knock into the back conflict, lane-change is conflicted, the emulation number of collisions of intersection conflict, the safety evaluation of urban traffic environment lower plane crossing is carried out with this.Traffic conflict evaluation methodology stability of instant invention overcomes over is bad, is affected by collector's subjective judgment relatively big, lacks the defect of comparability, have Practical Project applying value in carrying out the safety evaluation of urban traffic environment lower plane crossing.
Description
Technical field
The present invention relates to field of traffic safety field, especially a kind of utilize micro-simulation simulator PARAMICS and the conflict analysis software SSAM evaluation methodology carrying out safety level in plane intersection under urban traffic environment.
Background technology
In field of urban traffic, along with urban traffic environment becomes increasingly complex, resident's safety consciousness promotes day by day, and urban traffic safety is increasingly paid attention to widely.And the evaluation methodology of urban traffic safety is started late, compared with abroad, China is subject to the restriction that incident database is not enough in urban intersection safety evaluation field, some often can only be taked to substitute evaluation index and carry out the evaluation of urban intersection safety.Wherein the traffic conflict technique is most frequently used, but owing to the gatherer process of traffic conflict is affected relatively big by collector's subjective judgment, the data deficiency comparability that often different acquisition personnel collect each other.
Along with the development of computer technology, constantly ripe microscopic simulation technology is widely used, and particularly in the research of urban transportation, has gradually formed and has utilized microscopic simulation technical modelling urban intersection operation conditions, and then researched and analysed.But microscopic simulation technology is applied to urban intersection safety evaluation, and also in the starting stage, correlational study is less.
Summary of the invention
Goal of the invention: the data randomness in order to solve existing for existing the traffic conflict technique is big, the problem lacking comparability, the invention provides and a kind of utilize micro-simulation simulator PARAMICS and the conflict analysis software SSAM evaluation methodology carrying out safety level in plane intersection under urban traffic environment.
Technical scheme: the evaluation methodology of a kind of urban traffic environment lower plane crossing safety, including step:
1) carried out the collection of field data by data acquisition module, the content of collection includes road parameters information and the traffic information at level-crossing place；
2) setting up urban traffic environment lower plane crossing PARMICS phantom according to urban intersection, the road parameters information according to collecting in step 1 is configured；
3) according to the traffic information collected in step 1, the corresponding parameter of the urban traffic environment lower plane crossing PARMICS phantom set up is demarcated；
4) run PARMICS phantom, export track of vehicle file, change the random generator seed of PARAMICS software, repeat aforesaid operations, carry out Multi simulation running, eliminate error, export final track of vehicle file；
5) adopt the track of vehicle file that step 4 is obtained by SSAM software to carry out conflict analysis, and conflict of knocking into the back, lane-change conflict and intersection conflict are carried out safety evaluation.
It is more highly preferred to, in step 1, described road parameters information includes level-crossing entrance driveway width, entrance driveway number of track-lines, central strip bandwidth, bicycle lane width, access road kerb radius, and described traffic information includes entrance driveway traffic flow, the big dolly ratio of entrance driveway, entrance driveway speed, entrance driveway track time headway.
Being more highly preferred to, in step 1, when crossing is equipped with signal lights, the collection of described road parameters information also includes signal lamp cycle duration, signal lights phase place phase sequence, signal lights each phase place long green light time, signal lights complete red time, signal lights yellow time.
Being more highly preferred to, in step 5, described safety evaluation content includes average conflict number, Min-conflicts number of times, maximum collision number of times and number of collisions variance.
Beneficial effect: the evaluation methodology of a kind of safety level in plane intersection under urban traffic environment of the present invention utilizes micro-simulation simulator PARAMICS to set up urban environment lower plane crossing PARAMICS phantom to carry out conflict analysis in combination with conflict analysis software SSAM, traffic conflict evaluation methodology stability of overcoming over is bad, affected bigger by collector's subjective judgment, lack the defect of comparability, there is Practical Project applying value in carrying out the safety evaluation of urban traffic environment lower plane crossing.
Accompanying drawing explanation
Fig. 1 is the flow chart of the evaluation methodology of a kind of safety level in plane intersection under urban traffic environment of the present invention；
Fig. 2 is that in embodiment knock into the back number of collisions scattergram in crossing；
Fig. 3 is lane-change number of collisions scattergram in crossing in embodiment；
Fig. 4 is intersection conflict number scattergram in crossing in embodiment.
Detailed description of the invention
Refer to shown in Fig. 1, the invention discloses the evaluation methodology of a kind of safety level in plane intersection under urban traffic environment, comprise the following steps:
1) field data collection: field data collection mainly includes level-crossing entrance driveway width, entrance driveway number of track-lines, central strip bandwidth, bicycle lane width, entrance driveway traffic flow, the big dolly ratio of entrance driveway, entrance driveway speed, entrance driveway track time headway, access road kerb radius, if crossing is equipped with signal lights, also need to gather signal lamp cycle duration, signal lights phase place phase sequence, signal lights each phase place long green light time, signal lights complete red time, signal lights yellow time.All data collected by be applied to this method step 2,3 model set up and parameter calibration.
2) urban traffic environment lower plane crossing PARAMICS phantom is set up: set up urban traffic environment lower plane crossing PARAMICS phantom according to urban intersection, the data simultaneously collected according to step 1 attention are to level-crossing entrance driveway width, entrance driveway number of track-lines, central strip bandwidth, bicycle lane width, access road kerb radius is modified, if crossing is equipped with signal lights, also need signal lamp cycle duration, signal lights phase place phase sequence, the each phase place long green light time of signal lights, the signal lights complete red time, signal lights yellow time is configured.
3) parameter calibration: the data collected in integrating step, to in step 2 set up urban traffic environment lower plane crossing PARAMICS phantom carry out parameter calibration, during to the traffic flow of each entrance driveway, big dolly ratio, entrance driveway speed and entrance driveway vehicle headstock from etc. parameter demarcate.
4) run Multi simulation running and export track of vehicle file: through the parameter calibration of step 3, the PARAMICS phantom set up in step 2 has been able to simcity level-crossing operation conditions, PARAMICS software is set so that it is can export track of vehicle file after running PARAMICS phantom.For eliminating error immediately, change the random generator seed of PARAMICS software, carry out Multi simulation running, make simulation result have statistical significance.
5) SSAM software is used to carry out safety evaluation: to adopt the track of vehicle file that Multi simulation running output is obtained by SSAM software to carry out conflict analysis, and number of collisions is carried out statistics description, difference according to conflict type, by conflict of knocking into the back, lane-change conflict and intersection conflict, statistical average conflict number, Min-conflicts number of times, maximum collision number of times and number of collisions variance respectively, in this, as Intersection Safety result.
Refer to Fig. 2 to Fig. 4, below for be evaluated as the specific embodiment of example based on above-mentioned evaluation methodology with the traffic conflict of certain level-crossing under certain urban environment domestic:
1st step, field data gathers: data acquisition is certain signalized intersection place under certain urban environment domestic, acquisition time is 1 workaday morning, in, three each 2 hours of time periods of evening, amount to 6 hours, collection data include: entrance driveway traffic flow, the big dolly ratio of entrance driveway, entrance driveway speed, entrance driveway track time headway, and the entrance driveway width of this level-crossing, entrance driveway number of track-lines, central strip bandwidth, bicycle lane width, access road kerb radius, signal lamp cycle duration, signal lights phase place phase sequence, the each phase place long green light time of signal lights, the signal lights complete red time, signal lights yellow time.All data collected by being applied to the 2nd of the present embodiment the, the model of 3 steps is set up and parameter calibration.
2nd step, set up urban traffic environment lower plane crossing PARAMICS phantom, : as shown in Figure 2, this example establishes urban traffic environment lower plane crossing PARAMICS phantom according to urban intersection, apply the data collected in the 1st step, to including level-crossing entrance driveway width, entrance driveway number of track-lines, central strip bandwidth, bicycle lane width, access road kerb radius, signal lamp cycle duration, signal lights phase place phase sequence, the each phase place long green light time of signal lights, the signal lights complete red time, the information such as signal lights yellow time have been arranged.
3rd step, parameter calibration: according to the data collected in the 1st step, the urban traffic environment lower plane crossing PARAMICS phantom set up in the 2nd step is carried out parameter calibration, when the content of demarcation includes the traffic flow of each entrance driveway, big dolly ratio, entrance driveway speed and entrance driveway vehicle headstock from etc. parameter.
4th step, run Multi simulation running and export track of vehicle file: through the parameter calibration of the 3rd step, the PARAMICS phantom set up in the 2nd step has been able to simcity level-crossing operation conditions, PARAMICS software is set, make it can export track of vehicle file after running PARAMICS phantom, change the random generator seed of PARAMICS software, carry out 100 emulation, to eliminate random error, simulation result is made to have statistical significance.
5th step, SSAM software is used to carry out safety evaluation: to adopt the track of vehicle file that 100 simulation datas are obtained by SSAM software to carry out conflict analysis, and number of collisions is carried out statistics description, in the present embodiment according to conflict type difference, enter the conflict analysis of conflict of knocking into the back, lane-change conflict and intersection conflict three types altogether, average conflict number, Min-conflicts number of times, maximum collision number of times and number of collisions variance have been added up in every kind of conflict respectively, as shown in table 1.
Table 1 number of collisions statistics describes
| Conflict type | Average number of collisions | Min-conflicts number | Maximum collision number | Number of collisions standard deviation |
| Knock into the back conflict | 35.54 | 21 | 59 | 8.77 |
| Lane-change is conflicted | 24.84 | 12 | 40 | 6.46 |
| Intersection conflict | 82.4 | 63 | 124 | 10.03 |
Draw the scattergram of three types conflict according to table 1 Plotting data respectively, see Fig. 2, Fig. 3 and Fig. 4.
In this, as Intersection Safety result, both safety evaluation can be used for by predetermined secure threshold, it is also possible to compare in quantification.
Claims (2)
1. an evaluation methodology for urban traffic environment lower plane crossing safety, is characterized in that including step:
1) carried out the collection of field data by data acquisition module, the content of collection includes road parameters information and the traffic information at level-crossing place；
2) setting up urban traffic environment lower plane crossing PARAMICS phantom according to urban intersection, the road parameters information according to collecting in step 1 is configured；Described road parameters information includes level-crossing entrance driveway width, entrance driveway number of track-lines, central strip bandwidth, bicycle lane width, access road kerb radius；
3) according to the traffic information collected in step 1, the corresponding parameter of the urban traffic environment lower plane crossing PARAMICS phantom set up is demarcated；Described traffic information includes entrance driveway traffic flow, the big dolly ratio of entrance driveway, entrance driveway speed, entrance driveway track time headway；
4) run PARAMICS phantom, export track of vehicle file, change the random generator seed of PARAMICS software, repeat aforesaid operations, carry out Multi simulation running, eliminate error, export final track of vehicle file；
5) the track of vehicle file that step 4 is obtained by SSAM software is adopted to carry out conflict analysis, and conflict of knocking into the back, lane-change conflict and intersection conflict are carried out safety evaluation, described safety evaluation content includes average conflict number, Min-conflicts number of times, maximum collision number of times and number of collisions variance.
2. the evaluation methodology of urban traffic environment lower plane crossing safety according to claim 1, it is characterized in that: in step 1, when crossing is equipped with signal lights, the collection of described road parameters information also includes signal lamp cycle duration, signal lights phase place phase sequence, signal lights each phase place long green light time, signal lights complete red time, signal lights yellow time.
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| CN109146299B (en) * | 2018-08-29 | 2021-08-31 | 广东工业大学 | Road intersection safety state evaluation method |
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