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

scholarly journals DETERMINING THE MAXIMUM SPEED LIMIT IN URBAN ROAD TO INCREASE TRAFFIC SAFETY

2018 ◽  
Vol 80 (5) ◽  
Author(s):  
Gito Sugiyanto ◽  
Siti Malkhamah
Keyword(s):  
Traffic Safety ◽  
School Safety ◽  
Maximum Speed ◽  
Speed Limit ◽  
Light Truck ◽  
Urban Road ◽  
Road Traffic Safety ◽  
Road Type ◽  
Wheeled Vehicles

Speed is one of the main risk factors in road traffic safety and become a traffic problem in developing countries. Three factors that cause accidents are human factor, vehicle, and environment. Speeding is one of the main cause factors in traffic accident. Traffic speed must be limited adjust with the activities in the street and potential accident. The aim of this research is to determine the maximum speed limit in urban road to increase traffic safety and to analyze the percentage of vehicle exceeding speed limit. The method to determine maximum speed limits using 85th percentile. Based on the analysis result, the proposed maximum speed limit on urban road for arterial road type 4/2-UD residential and 4/2-UD CBD is 60 km/h for motorcycle and passenger car, 55 km/h for pick up and light truck, and 50 km/h for bus and truck. Proposed maximum speed limit for collector road type 2/1-UD office area is 45 km/h for motorcycle and 40 km/h for four-wheeled vehicles or more while for collector road type 2/1-UD CBD is 40 km/h for motorcycle and 35 km/h for four-wheeled vehicles or more. The installation of speed limit sign is less effective to reduce the vehicle speed, the speed only reduce 2.9-55 km/h (5.6-10.1%). More than 46.5% of motorcycle users ride exceeding speed limit followed by the passenger cars users (39.43%), microbus/city bus at 31.63%, bus Trans at 28.75%, pick up and light truck at 24.69%. The maximum speed limit in school safety zone on hours/after school is 30 km/h with the consideration that the pedestrian fatality rate on 30 km/h has probability of death 10%.

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.

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

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.

Study on the Mode of Lane Changing for Turning in Urban Road

CICTP 2018 ◽  
2018 ◽  
Author(s):  
Shiqiang Cheng ◽  
Liyang Wei ◽  
Xuelan Ma ◽  
Jianfeng Shen ◽  
Jian Wang
Keyword(s):  
Lane Changing ◽  
Urban Road
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