Modeling Dual-Ring Actuated Signals with TRANSYT-7Fby Warren Tighe, DKS Associates, Oakland, CA, USA,
Kevin Fehon, DKS Associates, Oakland, CA, USA,
Document Type: Proceeding Paper
Part of: Microcomputer Applications in Transportation II
Current and potential future methods of using the TRANSYT-7F computer program to model dual-ring actuated traffic signals are discussed. First the problems encountered in using this fixed-time signal model in applications involving actuated signals are described. The various techniques currently used to work around these problems are discussed. These include the use of calculated average actuated phase times, the use of artificial start-up lost times and green extensions to model stages shorter than the intergreen time, holding splits constant during optimization, and using fixed-time output to select actuated phase parameters. Reference is made to current research and development efforts aimed at developing guidelines for modeling of actuated signals, and to computer programs which assist a user in preparing input data for actuated signals. The work-around techniques are shown to be inefficient and inadequate to overcome the current limitations of the model.
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