The desired gap headway of drivers, while close following, represents the main parameter in determining the following distance between vehicles.  This paper uses the raw individual vehicles data taken from loop detectors for millions of vehicles used M25 and M42 in order to estimate the gap headway distributions between successive pairs of vehicles.  The data used in this paper were filtered so...

When the right-turn vehicles share the same phase with pedestrians on divided lanes at intersection, the stopped buses or mediumsize vehicles that closed to the right-turn vehicleswould block the viewof drivers and pedestrians from the far-side of crosswalk.This paper aims at analyzing the changes of lag/gap acceptance behavior with/without considering sight obstruction and the headway of follo...

Headway or inter-arrival time of vehicles is an important parameter in traffic flow, especially in urban roads, since this is one of the main parameters to determine the minimum (safe) gap between vehicles and the capacity. The studies done on headway analysis have mostly concentrated on homogeneous traffic where the flow follows lane discipline. This ideal situation does not exist on Indian ur...

The study is aimed at exploring empirical headway derived from Erlang and Pearson type III distribution and comparing the resultant distributions. The Erlang distribution is a simplified form of the Pearson type III. In circumstance where vehicle overtaking is very limited and the ensuing headway values are small, Pearson type IIIor the Erlang distribution may be used to represent the headway f...

This paper studies some of the theoretical questions of large openings or gaps in a single stream of traffic. A gap in the traffic stream is defined as a headway between vehicles greater than or equal to some minimum size -say x. Several authors have studied the probability distribution of the wait which a randomly located observer must endure before he finds a gap. This paper, while briefly re...

Traditional transit service quality measures separate waiting time from service reliability, thereby underestimating the real cost of waiting and failing to evaluate the impact of unreliability on passengers. Analyzing passenger behavior, we show that for short headway service, the cost of waiting involves not only the mean time spent waiting on the platform, but also “potential waiting time,” ...

Knowledge of fundamental traffic flow characteristics and vehicle dynamic behavior are essential for operation of transportation system. The fundamental characteristics of speed and flow have been studied. Time-headway distribution of urban heterogeneous traffic was also studied. An appropriate methodology was adopted to collect and extract headway data. The methodology for choice of best fitti...

Introduction The time headway of vehicles is of fundamental importance in traffic engineering applications like capacity, levelof-service and safety studies. Further, the performance of traffic simulation depends on inputs into the simulation process and ‘accurate vehicle generation’ is critical in this context. Thus, it is important to define headway distribution pattern for the purpose of ana...

Time headway is a significant traffic flow parameter that affects the capacity and safety of highways and freeways. Time headways are broadly used in different areas of traffic and transport engineering such as capacity analysis, safety studies, car following and lane changing behavior modeling, and level of service evaluation. In this paper, the time headway distribution is investigated for an...