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Signal control road network path flow estimation method based on sampled vehicle trajectory data

A vehicle trajectory and flow technology, which is applied to road vehicle traffic control systems, traffic flow detection, traffic control systems, etc. Effects of increased complexity, penetration and coverage, and broad applicability

Active Publication Date: 2021-08-10
TONGJI UNIV
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AI Technical Summary

Problems solved by technology

In order to solve the uncertainty of the OD estimation problem, the use of new data such as trajectories in existing models is often limited to sample flow or travel time information to calibrate traditional model parameters or strengthen constraints. The traffic flow dynamic information contained in trajectory data not fully exploited

Method used

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  • Signal control road network path flow estimation method based on sampled vehicle trajectory data
  • Signal control road network path flow estimation method based on sampled vehicle trajectory data
  • Signal control road network path flow estimation method based on sampled vehicle trajectory data

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Embodiment

[0097] The present invention verifies the path flow estimation method through the following simulation cases, as figure 2 As shown, the simulation model was established using VISSIM software based on the "four vertical and three horizontal" road network in Shinan District of Qingdao City. There are 25 intersections in the road network, including 18 signal-controlled intersections (circled in the figure). shown), 190 flow directions, a total of 28 OD points in the whole network, and a total of 311 paths to be estimated. The simulation model is calibrated during the morning peak period (7:00-9:00) of the timing plan in March 2019, and the test data from March 1st to March 12th, 2019 are selected for statistics. The vehicle input of the simulation model is calibrated at the traffic flow level of the simulation model. The simulation time is set to 9000s, of which the first 1800s is used as a warm-up period, and the remaining 7200s is used as a verification period. The upload fr...

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Abstract

The invention relates to a signal control road network path flow estimation method based on sampled vehicle trajectory data. The method comprises the following steps: 1) obtaining a prior matrix of flow direction flow according to sampled vehicle trajectory data in a road network; 2) obtaining a flow prior estimation value of each path according to the sampled path flow in the road network, and constructing a prior matrix of path flow; and 3) constructing a generalized least square model which takes the error minimization of the path flow and the flow direction flow as a target, and solving the model through a gradient search algorithm to obtain an optimal path flow estimated value. Compared with the prior art, the method has the advantages of pure track data input, few hypothesis conditions, wide applicability and the like.

Description

technical field [0001] The invention relates to the field of traffic operation evaluation, in particular to a method for estimating the path flow of a signal-controlled road network based on sampled vehicle trajectory data. Background technique [0002] OD flow is an important indicator of road network traffic demand. Path flow refers to the flow of traffic flow between any OD pair distributed in all actual driving paths. Compared with OD flow, the traffic flow of travelers in the road network is further considered. Path selection can make a finer-grained positioning of OD on the spatial flow and accumulation of traffic flow in the road network. [0003] Obtaining an accurate path flow matrix is ​​a key link in refined traffic control, and plays an important role in identifying key elements of the road network (such as road sections, passages, paths, etc.). At the level of traffic planning, OD flow and path flow are usually obtained through the traditional "four-step" metho...

Claims

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Application Information

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IPC IPC(8): G08G1/01
CPCG08G1/0125Y02T10/40
Inventor 唐克双姚佳蓉曹喻旻
Owner TONGJI UNIV
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