A two-stage fuzzy logic controller for traffic signals

✍ Scribed by Mohamed B. Trabia; Mohamed S. Kaseko; Murali Ande

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 378 KB
• Volume: 7
• Category: Article
• ISSN: 0968-090X
• DOI: 10.1016/s0968-090x(99)00026-1

✦ Synopsis

This paper presents the design and evaluation of a fuzzy logic trac signal controller for an isolated intersection. The controller is designed to be responsive to real-time trac demands. The fuzzy controller uses vehicle loop detectors, placed upstream of the intersection on each approach, to measure approach ¯ows and estimate queues. These data are used to decide, at regular time intervals, whether to extend or terminate the current signal phase. These decisions are made using a two-stage fuzzy logic procedure. In the ®rst stage, observed approach trac ¯ows are used to estimate relative trac intensities in the competing approaches. These trac intensities are then used in the second stage to determine whether the current signal phase should be extended or terminated. The performance of this controller is compared to that of a trac-actuated controller for dierent trac conditions on a simulated four-approach intersection.