Critical Gap Calculation At Unsignalized Intersectionsby Occupancy Method

  • Dr. C.M. Vivek Vardhan , Shyamala Bhoomesh , Dr. SeelamSrikanth Reddy , Akella Naga SaiBaba , Dr. C. Srinivas Gupta


The behavior of accepting gap determines the capacity of an uncontrolled
intersection.Intersection performance influences the critical gap. Gap and lag give better results. Studies
reveal that developed countries exhibit good performance by adopting proper traffic rules. When a
minor road intersects a major road critical gap is to be considered. Critical gap concerns the safety of
traffic and pedestrians. In developed countries people follow traffic rules voluntarily. In some cities of
India, due to heavy traffic regulation of the traffic is difficult at intersections with no control. Pedestrian
safety is also of paramount importance. The aim of this paper is to calculatecritical gap and critical lag
separately. In this work we used the clearing behavior of vehicles in connection with gap and lag. The
clearing behavior of vehicles is studied along with lag and gap data procured from the local region at
two legged and three leg controlled intersections. It was observed that the critical lag and critical gap
values were dynamically changing with change in the volume of traffic and also pedestrians. Depending
on the nature of intersections, the values of critical gap and lag were observed to be quite changing.
The values of critical gapwere found to be more than critical lagin our study area.