Speed and Time Headway Distribution under Mixed Traffic Condition

Abstract

Time headway and speed distribution studies provide an insight into the aggregate flow of vehicles which have important applications in capacity estimation, Level of Service (LOS) analysis, safety analysis, etc. Analysis of time headways and speed of vehicles were conducted on the basis of data collected from four two-lane bidirectional roads in Assam, India by video recording technique. The paper intends to study time headway distribution of vehicles for the mixed vehicular flow and for different leader-follower vehicle pairs on the basis of six traffic flow levels [0-200, 200-400, 400-600, 600-800, 800-1000 and 1000-1200] PCU/h. Analysis of collected speed data is also carried out to obtain the speed distribution patterns in mixed traffic condition and also vehicle class-wise speed analysis is performed to identify the impact of overall flow and vehicle composition on speed. The results of this paper can find direct applications in developing micro-simulation models.