International Journal of Enhanced Research in Science Technology & Engineering

Traffic Control and management poses a major problem in urban cities, especially in rapidly growing & motorizing cities. In urban cities at road intersection traffic lights (Red, Green and Yellow) is used for controlling the congestion. For this there a set up of complete system called traffic control system at the road intersection. But there is chance of failure of individual unit of traffic control system. Reliability of traffic control system is therefore the most important feature to maintained above some acceptable threshold value. The maintenance of individual units can also be planned and implemented once the level of reliability for given instance of time is known. The paper therefore aims at determining the threshold reliability of traffic control system. In this paper mathematical model for calculating the reliability of traffic control system is designed. KeywordsTraffic Control System, Mathematical Model, Reliability. Corresponding Author: Er. Priyanka Sharma, M.Tech. (ECE), JCD College of Engineering, Sirsa. Introduction Optimization of functioning of traffic signal is considered one of the most effective measures to address road congestion problem. Traffic management is one of the measure term of road security. However the optimization of signal timing is complex due to randomness complexity and nonlinearity of the transportation system. Congestion problem on road can be avoided by using effective and reliable traffic control system. It is therefore drew the attention of researcher to determine the condition when reliability of traffic control system would be at stake. Therefore, it needed a model to deal with the reliability of traffic control system. Moved by these ideas the research for accessing the reliability of traffic system has been undertaken. The reliability is based on incremental reliability of its parts like error detector element, feedback element, traffic light controller and lights (Red, Yellow and Green). This paper therefore demonstrates a mathematical model for determining the equivalent reliability by taking each of its components all together. Proposed Problem It is aimed to assess the reliability of traffic control system consisting of various units like sensor, error detector element, feedback element, controller and lights. As shown in fig.1, obtain the mathematical model of equivalent reliability, Req. Description of Traffic Control System The main components of traffic control system are sensor, traffic controller and traffic lights. The block diagram for Traffic Control System can be shown as: INTERNATIONAL JOURNAL OF ENHANCED RESEARCH IN SCIENCE TECHNOLOGY & ENGINEERING VOL.2, ISSUE 2, MARCH 2013 ISSN NO: 2319-7463 www.erpublications.com 2 Fig.:Block Diagram for Traffic Control System It is required that the traffic control system should work without fail and uninterruptedly but such an operation could only be possible when every component of system works with acceptable reliability. Whole system for traffic control is mainly divided in to two parts. First part consists of sensor and error detector element and failure of controller and lights. The sensor is used to sense the inputs and gives output to controller. The error detector element compares the two inputs and gives the error output to sensor. The controller will give the required information to traffic lights. With the consideration of output of controller the traffic signal (Red, green and yellow) will glow .In order to get effective control it is required that system and its components should maintain a reliability ≥ Rth. It has been aimed to develop mathematical model for reliability assessment of traffic control system. The reliability of generation system basically depends on each component of the system. It is therefore a mathematical model has been developed in this dissertation by taking into account the reliability of individual component as partial reliability and there upon deriving of expression for equivalent reliability of generation system as a whole. Mathematical Approach The mathematical model for reliability assessment has been developed by way of equivalent reliability approach. It represents the overall reliability of traffic control system. Also it consists of resultant effect of reliability due to individual components. 1. Expected Failure In Traffic Control System In traffic Control System failures which affect overall system reliability are: Error Detector element, Sensor, Light Controller and Signal Lights (Red, Yellow and Green).Each of these constitute small components and it is therefore the reliability of these parts are function of partial reliability of internal parts. For example: The generator is globally reliable only when all of its elements like generator winding, Excitation, Rotor etc. works reliability. Thus we can say that reliability of above system depends upon so many factors. The equivalent reliability model has been shown in Fig.2. INTERNATIONAL JOURNAL OF ENHANCED RESEARCH IN SCIENCE TECHNOLOGY & ENGINEERING VOL.2, ISSUE 2, MARCH 2013 ISSN NO: 2319-7463 www.erpublications.com 3 Fig.2. Equivalent Reliability Model For Traffic Control System