双车道公路超车视距计算方法  

Calculation method of overtaking sight distance for dual-lane highway

作　　者：王润琪[1] 周永军[1] 肖传恩[1] 

机构地区：[1]中南林业科技大学物流学院,湖南长沙410004

出　　处：《交通运输工程学报》2011年第3期68-73,87,共7页Journal of Traffic and Transportation Engineering

基　　金：湖南省自然科学基金项目(07JJ6024;07JJ6125)

摘　　要：从安全行车角度分析了影响双车道公路超车视距的5个因素,设计了超车汽车、被超车汽车和对向来车三者在双车道公路的行车示意图,建立了计算超车汽车从开始超车到完成超车所需超车视距的数学模型。确定了汽车制动距离、同车道车头间距等计算参数,运用数学解析方法,提出了超车视距的具体计算公式。选择不同设计速度和行车速度,计算了小汽车和货车在双车道公路的超车视距。分析结果表明:双车道公路超车视距与公路设计速度、超车汽车的超车速度、被超车汽车和对向来车的行驶速度、同车道车头间距有关;当被超车汽车和对向来车的速度小于超车速度一半时,超车视距的计算值才接近规定值;从安全角度看,中国双车道公路超车视距规定值偏小。5 factors affecting the overtaking sight distance of dual-lane highway were analyzed from the view of safe driving.The running sketch map of overtaking car,overtook car and opposite car on dual-lane highway was designed.The mathematic model of calculating overtaking sight distance for overtaking car from beginning overtaking to finishing overtaking was established.The calculating parameters were defined such as braking distance and space headway on same lane etc,and the specific calculating formula of overtaking sight distance was proposed by means of mathematic analysis method.According to different design speeds and driving speeds,the overtaking sight distances of car and truck on dual-lane highway were calculated. Analysis result indicates that the overtaking sight distance of dual-lane highway is concerned with the design speed of highway,the overtaking speed of overtaking car,the speeds of overtook car and opposite car,and space headway on same lane.When the speeds of overtook car and opposite car are less than a half of overtaking speed,the calculated value of overtaking sight distance is just close to its specified value.Specified overtaking sight distance of dual-lane highway is smaller from safety view.4 tabs,1 fig,10 refs.

关 键 词：双车道公路 超车视距 设计速度 车头间距 行驶速度 超车速度 

分 类 号：U441[建筑科学—桥梁与隧道工程]