Modeling Permissive Movements in TRANSYT-7F

by Charles E. Wallace, Univ of Florida, Gainesville, FL, USA,
Frank J. White, Univ of Florida, Gainesville, FL, USA,
Antoinette Wilbur, Univ of Florida, Gainesville, FL, USA,



Document Type: Proceeding Paper

Part of: Microcomputer Applications in Transportation II

Abstract:

Traffic Network Study Tool (TRANSYT-7F) is one of the most widely used traffic flow analysis and traffic signal timing optimization models in the United States and elsewhere. Through 'Release 4,' the model dealt explicitly with protected or unopposed traffic movements. Movements that must yield to other movements such as permitted-only left turns could only be approximated. Permitted plus protected operations could not be modeled at all. This paper describes the development of an algorithm to allow the explicit modeling of permitted traffic movements. The model was calibrated with field data collected in the Washington, D. C. area. Additionally, explicit treatment of left turn 'sneakers' was also developed. This paper describes both algorithms and their implementation in the TRANSYT-7F program, which is now available as 'Release 5. '

Subject Headings: Traffic models | Traffic analysis | Traffic signals | Traffic flow | Optimization models | Left turns | Decision support systems | United States | Washington

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