A Path Flow Estimation Method for Signal Control Road Network Based on Sampling Vehicle Trajectory Data

A vehicle trajectory and flow technology, which is applied to the traffic control system of road vehicles, traffic flow detection, traffic control system, etc. Increase in rate and coverage, reduce complexity, and wide-ranging effects

Active Publication Date: 2022-06-07
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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  • A Path Flow Estimation Method for Signal Control Road Network Based on Sampling Vehicle Trajectory Data
  • A Path Flow Estimation Method for Signal Control Road Network Based on Sampling Vehicle Trajectory Data
  • A Path Flow Estimation Method for Signal Control Road Network Based on Sampling Vehicle Trajectory Data

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Embodiment

[0097] The present invention verifies the path traffic estimation method through the following simulation cases, such as figure 2 As shown, the simulation model is built on the background of the "four vertical and three horizontal" road network in Shinan District, Qingdao, using VISSIM software. There are 25 intersections in the road network, of which 18 are 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 in the morning peak period (7:00-9:00) of the timing plan in March 2019, and the detection data from March 1st to March 12th, 2019 is selected for statistics, according to the average The traffic flow level of the simulation model is calibrated with the vehicle input. The simulation duration is set to 9000s, of which the first 1800s is used as the warm-up period, and the remaining 7200s is used as the verification p...

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Abstract

The invention relates to a method for estimating traffic flow in a signal-controlled road network based on sampled vehicle trajectory data. Path flow obtains the flow prior estimates of each path, and constructs the prior matrix of path flow 3) Constructs a generalized least squares model with the goal of minimizing the error between path flow and flow direction flow, and solves the model by gradient search algorithm to obtain the optimal Optimal path flow estimates. Compared with the prior art, the present invention has the advantages of pure trajectory data input, few assumptions, 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 path flow of an information-controlled road network based on sampled vehicle trajectory data. Background technique [0002] The OD flow is an important indicator to characterize the traffic demand of the road network. The route flow refers to the flow of the traffic flow between any OD pair distributed on all actual driving paths. Route selection can make more precise positioning of the spatial flow and agglomeration of traffic flow in the road network by OD. [0003] Obtaining an accurate route flow matrix is ​​a key link in refined traffic management and control, and plays an important role in the identification of key elements of the road network (such as road sections, passages, paths, etc.). At the traffic planning level, the OD flow and path flow are usually obtained by the traditional "four-step" method to obtain the traffic generation a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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