Speed limit model of expressway in rain and fog

2021 ◽  
Author(s):  
Cheng Fang ◽  
Yuanhui Li ◽  
Beirui Yan ◽  
Wenfeng Zhu
Keyword(s):  
Speed Limit ◽  
Limit Model

scholarly journals Successive-Stage Speed Limit on Exit Ramp Upstream of Direct-Type Freeway in China

2012 ◽  
Vol 2012 ◽  
pp. 1-16
Author(s):  
Hongwei Li ◽  
Jian Lu ◽  
Yongfeng Ma ◽  
Yuanlin Liu
Keyword(s):  
Prediction Model ◽  
Curve Fitting ◽  
Polynomial Regression ◽  
Successive Stage ◽  
Influential Factor ◽  
Speed Limit ◽  
Vehicle Type ◽  
Limit Model ◽  
Speed Prediction ◽  
Exit Ramp

The first objective of this study is to analyze a successive-stage speed limit model developed for vehicles along the exit upstream ramp of direct-type freeway in China. This paper (1) explains the necessity to implement speed limit to the exit ramp upstream, (2) analyzes whether speed limit is related to the length of the deceleration lane, vehicle type, saturation, and turning ratio and (3) proposes a speed prediction model and calibrates speed-limit sign validity model and establishes successive-stage speed limit model.The results.Δν85≥10illustrates the necessity of the using speed limit on the exit ramp. Speed-deceleration lane length curve presents two trends bounded by 200 m, so the speed limit should be in accordance with the deceleration length. Speed-small vehicle curve closing to speed-large vehicle curve presents that the vehicle type is not the factor of the speed limit. After curve fitting and polynomial regression, saturation is considered to be the most influential factor of speed. Speed-saturation prediction model and calibrated speed-limit sign validity model are built through linearization. According to the above results, successive-stage speed limit model is established. An exit ramp was implemented to verify the feasibility and validity of the model.

A Speed Limit Model of Vehicle for Urban Road Hazmat Transportation

ICCTP 2009 ◽  
2009 ◽  
Author(s):  
Yunpeng Wang ◽  
Wencai Sun ◽  
Shiwu Li ◽  
Gunan Li ◽  
Jingjing Tian ◽  
...  
Keyword(s):  
Speed Limit ◽  
Urban Road ◽  
Limit Model ◽  
Hazmat Transportation

Exploration on Speed-Limit Signs of Traffic Accident Section on Freeways

2013 ◽  
Vol 361-363 ◽  
pp. 2349-2352 ◽  
Author(s):  
Qiong Wu ◽  
Jian Jun Wang
Keyword(s):  
Transition Zone ◽  
Traffic Safety ◽  
Traffic Accidents ◽  
Buffer Zone ◽  
Speed Limit ◽  
Freeway Traffic ◽  
Limit Model ◽  
Field Of Vision ◽  
Accident Site ◽  
Relevant Factors

In order to improve freeways traffic safety, reduce staff and vehicles casualties and prevent secondary traffic accidents, the accident site section on freeway is divided into six regions of the warning zone, the upstream transition zone, the buffer zone, the accident zone, the downstream transition zone and the termination zone. Establish the warning zone speed-limit model by considering the relevant factors of driver's field of vision and transportation distance of visual cognition and then speed-limit programs are proposed according to the warning area speed-limit model. Speed-limit signs of the warning zone take phased settings based on both of those. The results show that the proposed warning area speed limit model conforms to the actual need, decision science, and having important practical value for freeway traffic safety.

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