Journal Article•
Relationship between Speed Difference and Crash Rate on Freeway
TL;DR: It studies the relationship between speed difference and crash rate, using speed and accident data of nine freeway in China to show that the accident rate has obvious correlation with the dispersion of speed.
Abstract: It studies the relationship between speed difference and crash rate,using speed and accident data of nine freeway in China. Research shows that the accident rate has obvious correlation with the dispersion of speed. According to the accident rate and speed scatter distribution,several kinds of model are fitted,The significant level of F as well as R2 are analyzed arriving at the index distribution model of accident rate and speed standard deviation. It is significant to guaranteeing the traffic safety on expressway.
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TL;DR: In this article, the authors examined how many and where variable speed limit signs are to be placed and the speed limits to be set and proposed a bilevel programming model to perform this decision making operation.
Abstract: Variable Speed Limit Sign (VSLS) Systems enable speed limits to be changed dynamically in response to traffic conditions so that traffic incidents can be reduced significantly on freeway work zones. In this paper, we examined how many and where VSLS are to be placed and the speed limits to be set and proposed a bilevel programming model to perform this decision making operation. The appropriate speed limits and deployments of VSLS were got by case study, and they were analyzed by a simulation to prove the empirical features of traffic breakdown at freeway work zones. Then the results of model comparison and simulation evaluation illustrate that the proposed method outperforms existing models in terms of maximizing information benefit and minimizing average queue length, total delay, and total stop frequency on the freeway work zone.
14 citations
26 Jul 2011
TL;DR: This work considers creating a model of the road in Vissim, a program of traffic simulation, collecting the parameters of vehicles and analyzing the data in Matlab, to find the speed of vehicles at the Liuxia section of the highway around Hangzhou City is limited.
Abstract: There are frequent accidents at the Liuxia section of the highway around Hangzhou City, that is from the 68th kilometer to the 75th kilometer. We consider creating a model of the road in Vissim, a program of traffic simulation, collecting the parameters of vehicles and analyzing the data in Matlab. Taking the standard deviation of vehicle speed as main referred index, the speed of vehicles at the section is limited, where the standard deviation is high.
1 citations
13 Jul 2011
TL;DR: An optimal model aiming at minimizing the accident rate is established to determine the number of VMS, taking economic cost and speed limits as constraints, and a corresponding VSL control method is proposed.
Abstract: When it comes to VSL (variable speed limits) control before a freeway main toll station, setting excess VMS (variable message signs) will result in a waste of resource and information redundancy At the same time, too few VMS can not manage to guide and smooth the traffic flow due to the poor continuity of VMS and further guarantee traffic safety Besides, different VSL programs may need different number of VMS However, there is no research to date proposing a method to determine the number of VMS and corresponding VSL programs Thus, an optimal model aiming at minimizing the accident rate is established to determine the number of VMS, taking economic cost and speed limits as constraints Accident rates for a different number of VMS are solved out, according to which optimal number of VMS is determined, and finally, corresponding VSL control method is proposed
09 Dec 2020