Signal coordination on busiest route to demote delay and travel time
Traffic congestion in urban areas has become a severe problem now-a-days due to rapid urbanization and industrialization. The important cause for it is increase in vehicle ownership due to which more and more people uses vehicle to travel for a short distance. The traffic congestion in India is more severe problem as compare to other countries because of rapid urbanization and rapid growth in population. The automobile population in India has increased from 0.3 million in 1951 to more than 45 million in 2001. The registered two wheelers contribute nearly seventy per cent of vehicle population in almost all cities; more than 90 per cent of automobiles are located in urban areas .As the traffic congestion problems increases day by day in urban areas it leads to various problems such as increase in delay, increase in travel time, more fuel consumption and it also contributes in environmental pollution. Thus to solve traffic congestion problems the traffic management system should work in efficient manner.
During peak hours many signalized intersection are operated beyond their saturated capacity due to which long queues are formed at intersection which creates problems like formation of shockwaves and sometimes causes intersection deadlock etc. Signal coordination can be done to solve such types of problems during peak hours at busy routes.
Signal coordination is one kind of a traffic management system in which the signals which are closely spaced to each other are coordinated so that the vehicle can move in an efficient manner through the set of signals Signal timing plays an important role in coordination so that the vehicles moving on a road proceeds through various intersection without stopping. Efficiency of signal coordination depends on spacing between intersections, traffic flow characteristics and cycle length. The objective of signal coordination is to pass the maximum number of vehicles through the corridor with minimum amount of stops in an appropriate manner.
Signal coordination is one the important techniques in traffic management system in which signals which are closely spaced to each other are coordinated so that the maximum number of vehicle over a coordinated stretch will get continuous green light while travelling over coordinated corridor. In this study the corridor which is selected has four intersections which are very close to each other hence such road network required to be coordinated to decrease queue length, delay and travel time A model of study area is simulated using PTV VISSIM. The results of uncoordinated and coordinated signals are analyzed considering basic aspects of traffic i.e. travel time and queue length.
VISSIM is microscopic multimodal traffic flow simulation software which is used to make simulation model of real condition by considering various factors such as driver’s behavior, lane changing operations and traffic characteristics. In this study simulation model of road network is prepared on PTV VISSIM. Parameters as model input is properly assigned while preparing simulation model this parameters are driver’s behavior, lane changing operation, composition and characteristics of vehicle, desired speed and acceleration of vehicles.
I n this study two simulation model is prepared on VISSIM one is existing condition model (uncoordinated system) and other network is coordinated system model. Signals timings plays vital role in coordination process hence signal controllers are used to set cycle length and signal timings. The two networks are compared to each other to identify the variation of delay, travel time and queue length.
Fig.4.Network model in PTV VISSIM
Article by :
Prof. Mohd Ameeenuddin
Civil Dept, ACET