A GIS‐Based Traffic Signal Coordination and Information Management System

Abstract

Abstract: This paper discusses research conducted at the Georgia Institute of Technology that investigated the use of geographic information system (GIS) technology as a tool in traffic signal information management and signalized intersection coordination. TRANSYT‐7F is the most widely used and respected computer model for optimizing the coordination of traffic signals. Unfortunately, creating an optimal TRANSYT‐7F model is very costly. The hypothesis of this research was that using a specialized GIS in conjunction with TRANSYT‐7F could enhance the process of coordinating a traffic signal system. The research resulted in the development of a GIS‐based traffic signal coordination and information system that operates on a microcomputer. This system is an improvement over existing TRANSYT‐7F models because relationships between intersections do not have to be encoded manually. Instead, the system takes advantage of the GIS's topologic data structure, which provides these relationships. The process of analyzing different network optimization scenarios is simplified with this system because the user need only to select intersections to be coordinated from the GIS graphic display rather than cutting and pasting from existing input files. Alternatively, the system can serve as a multipurpose signal information system and play a vital role in decision support. It can provide improved access to signal data and allows for swift identification of intersections that experience excessive delays or unacceptable levels of service.