Priority Based Traffic Control in Vehicular Ad-Hoc Network

Abstract

The convergence of telecommunication, computing, wireless, and
transportation technologies facilitates that our roads and highways can be both our
communications and transportation platforms. These changes will completely revolution when
and how access services, communicate, commute, entertain, and navigate, in the coming
future. Vehicular ad hoc networks (VANETs) are wireless communication networks that do
not require any fixed infrastructure, and support cooperative driving among communicating
cars on the road. Vehicles act as communication nodes and relays, forming dynamic vehicular
networks together with other near-by vehicles on the road and highways.This research paper
examines the possibility of deploying an priority based traffic signal control system in
intersections, a system that can base its control decision on information coming from cars.
Thus, each intersection with traffic lights is provided with a wireless infrastructure node that
can extract data from an existing VANET. Now, efforts have been made to create traffic lights
systems that can respond to the ever increasing traffic. Most of the signal control systems rely
on timing plans generated offline by traffic engineers using optimization models. These
systems are hard to maintain and do not respond well to traffic events, like a football game or
road construction,arrival of emergency vehicle. This research paper is focus on Priority based
traffic signal control in VANET. Priority based means change according to arrival of
emergency vehicle. So in priority based traffic signal control is give green signal to lane as per
the current fixed cycle strategy. For making Priority base first find emergency vehicle on road
using loop detector. So after each 60 seconds decision for green is taken based upon vehicle
type over lanes. Green signal given to the lane(road) which have emergency vehicle at traffic
signal. It may possible that more than one of lane having emergency vehicle at traffic signal.
Then as per arrival time of emergency vehicle we give green signal.