Sistema de controle semafórico por demanda de tráfego utilizando tecnologia GPRS.

Abstract

The lights can be programmed in different ways, depending on traffic conditions and route. In Operation in Fixed Time, the lights are programmed from historical data on traffic conditions on site. Operation or Acted On Demand Traffic, traffic lights respond to actual traffic on the site. Strategically, the lights can operate alone or networked with the traffic lights adjacent. The official manual on signaling traffic lights, with a focus on computing and programming of the times, was published by DENATRAN (National Traffic Department) in 1979 and its second edition published in 1984. A new manual is being drafted by a technical group formed by DENATRAN. For purposes of this study, Operation Acted is that which can respond to actual traffic because the traffic lights programmed in Fixed Time are not able to provide a new situation that might occur and make a decision consistent with the situation. In places where there are sudden changes in traffic - the peak hours, between peaks and fluctuations - the operation in Fixed Time is not attractive. According to Kell and Fullerton (1991), The Principle of Extension is widely applied to the actuated control strategies whose main objective is to optimize the crossing of an intersection as to time and fuel usage. The purpose of this paper is to develop an algorithm and a C program for implementation of the Principle of Extension in an architecture microcontroller, where the GSM network through GPRS technology to support communication between the traffic control system and a Supervisory Remote Control. A CT module 65 of SIEMENS is proposed to connect each controller to the GSM network. This document also presents all the difficulties encountered during its development, and proposals for future work.