摘要
大型车占混合交通流较大比重时,现有车辆换算系数和大型车对通行能力的影响系数不能适用。本研究对大型车为主的城市道路通行能力进行了探讨,利用跟车模型,对纯小客车车流和纯大型车车流通行能力进行分析。结果表明,对于主干路以下级别城市道路,大型车换算系数规范所取的2～3偏大;根据行车速度,按纯小客车车流和纯大型车车流的通行能力比值来选取大型车换算系数更加合理;当大型车比例大于0．7时,可以用相应的的混合流量通行能力来代表。
When heavy-vehicle taking a big proportion in mixed traffic flow,the existing standard vehicle equivalents and decreasing modulus of heavy-vehicle for capacity cannot reflect the actual traffic volume.Based on car-following model,the paper analyzed urban road capacity in dif- ferent situations including car only,heavy-vehicle only,and mixed traffic flow when heavy-vehicle engrosses an obvious proportion.The result indicates that standard vehicle equivalents using 2～3 is unreasonable great for the below artery urban road.It's more reasonable to use the ra- tio of urban road capacity in heavy-vehicle and cars as standard vehicle equivalents,when the proportion of heavey-vehicle is above 70 percent, the corresponding standard vehicle equivalents of mix traffic flow capcity can be used.
出处
《上海公路》
2007年第2期44-46,共3页
Shanghai Highways
关键词
道路
大型车
通行能力
换算系数
折减系数
跟车模型
Heavey-vehicle
traffic apacity
Standard vehicle equivalents
Decreasing modulus
Car-following model
