Abstract
Mashhad, the second largest city in Iran, like many other big cities, is faced with increasing traffic congestion owing to rapidly increasing population and annual pilgrimage. In recent years, Mashhad traffic and transportation authorities have been challenged with how to manage the increasing congestion with limited budgets for major roadway construction projects. Mashhad has recognized the need to improve the existing system capacity to get the most out of their cur- rent transportation system infrastructures. Since most of the delay times occur at signalized intersections, using an intelligent control system with proper capabilities to overcome the growing traffic requirements is recommended. Following comprehensive studies carried out with the aim of developing the Mashhad traffic control center, the SCATS adaptive traffic control system was introduced as the selected intelligent control system for integrating signalized intersections. The first intersection was equipped with this system in 2005. This paper describes the results of a field evaluation in which fixed actuated-coordinated signal timings are compared with those dynamically computed by SCATS. The ef- fects of this system on optimizing fuel consumption as well as reducing air pollutants are fully discussed. It is found that SCATS consistently reduced travel times and the average delay per stopped or approaching vehicle. The positive impact of adaptive traffic control systems on fuel consumption and air pollution are also highlighted.
Highlights
Intelligent Transportation Systems, or ITS, can be defined as the application of computing, information, and communications technologies to the real-time management of vehicles and networks involving the movement of people, goods, and services
This paper describes the results of a field evaluation in which fixed actuated-coordinated signal timings are compared with those dynamically computed by the Sydney Coordinated Adaptive Traffic System (SCATS) adaptive traffic control system
The first section was carried out in the intersections equipped with the adaptive system, and we investigated the differences between fixed time and the SCATS system in parameters like travel time, delay time in intersecttions, and so on
Summary
Intelligent Transportation Systems, or ITS, can be defined as the application of computing, information, and communications technologies to the real-time management of vehicles and networks involving the movement of people, goods, and services. Advanced Traffic Management System (ATMS) is a major subsystem of ITS, and real-time traffic control is considered to be one of the main operational processes of ATMS, with the aim of implementing adaptive traffic systems (Figure 1). The objects of this process are: 1) To minimize congestion while maximizing the movement of people and goods; 2) To improve the flow of traffic; and 3) To manage travel demand and prioritize it. Intersection control has its specific and important place as the most effective parameter influencing the quality of controlling street networks [2]
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