Assessment of Measure of Effectiveness of Two-lane Roads Under Non-homogeneous Traffic Conditions

Gayani Rajapaksha, S. Bandara
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Abstract

One aspect of measure of effectiveness of two-lane road is freedom of passing manoeuvre. Highway Capacity Manual (HCM) use percent time spent following (PTSF) as a measure to evaluate freedom of passing manoeuvre. Several researchers found that PTSF is incompatible with nonhomogeneous traffic conditions. Different follower-related performance measures, namely, percent followers (PF), follower density (FD) and the number of followers as a proportion of capacity (NFPC), Percent Impeded (PI), have been evaluated and a new measure called Stripped Based Follower Density (SFD) is introduced considering driving behavior of heterogeneous traffic condition. Data is collected from 12 two lane roads in Sri Lanka using a 2.5 second time gap suggested as driver perception -reaction time by AASSHTO to identify followers. LOS threshold values for SFD were introduced using K-mean clustering technique and compared with HCM LOS threshold.
非均匀交通条件下双车道道路有效性测度评价
衡量双车道道路通行效率的一个方面是车辆通行自由。《公路通行能力手册》(HCM)采用跟随时间百分比(PTSF)作为评价通行自由的指标。一些研究者发现PTSF与非同质交通条件不相容。对不同的跟随者相关性能指标,即跟随者百分比(PF)、跟随者密度(FD)和跟随者数量占容量的比例(NFPC)、受阻碍百分比(PI)进行了评价,并引入了基于剥离的跟随者密度(SFD)这一考虑异构交通条件下驾驶行为的新指标。数据收集自斯里兰卡的12条双车道道路,使用AASSHTO建议的驾驶员感知反应时间2.5秒的时间间隔来识别追随者。采用k均值聚类技术引入SFD的LOS阈值,并与HCM LOS阈值进行比较。
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