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Determination of optimal successor function in phase-based control using neural network

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3 Author(s)
Wong, S.C. ; Dept. of Civil & Structural Eng., Hong Kong Univ., Hong Kong ; Law, W.H. ; Tong, C.O.

A phase-based method for fixed-time signal control of traffic improves significantly the junction performance over conventional stage-based method of control due to the higher flexibility in specification of signal timings, where the control variables comprise the start and duration of green phases and the cycle time at which the junction is operated. The cycle-structure is specified by a successor function, a combination of 0 and 1 for all incompatible pairs of phases, which indicates the order of phases in a cycle. Normal procedure optimises the timings for each of these successor functions to determine the best timing plan. The computing time is found to be approximately proportional the number of such functions. To reduce the computational requirement, and hence enhance its applicability to real-time actuated control, a neural network is employed to help identify the optimal successor function for further optimisation of timings. Encouraging results were obtained

Published in:

Intelligent Vehicles Symposium, 1996., Proceedings of the 1996 IEEE

Date of Conference:

19-20 Sep 1996