Analysis of the Influence on-Ramp to the Vehicle Headway on the Jakarta-Cikampek Toll Road in Indonesia

Abstract

The distance between vehicles becomes more important in driving safely behind the vehicle in front of a steady stream of traffic or in creating tools that can control   autonomous cars. This headway creates a buffer to prevent a rear-end collision, should the driver need to stop in an emergency. The vehicle headway is expressed by the distance between the rear bumper of a vehicle and the front bumper of the vehicle behind it, which is usually expressed in meters. If it is assumed that vehicles are spread evenly along the road, the headway can be calculated by dividing the density by the volume of vehicles in each lane. The method in this study uses the measurement of the instantaneous average speed and volume of vehicles in one lane. The distance between vehicles or the headway is carried out using Greenshield's model. The output of the headway is presented in the form of a relationship between vehicle volume on the main road and vehicle volume on the ramp. Distance between vehicles is stabilize at 4 meters when the flow of traffic reaches more than 6000 pcu/hour. Increasing traffic flow from the on-ramp influence the distance of vehicle by about 5%.