Adaptive traffic signal control systems present the potential to significantly reduce delay, travel time, stops, and fuel consumption relative to current arterial traffic management practices. However, this technology—now referred to as adaptive-control software (ACS) by FHWA—has not been widely deployed in the United States, in part because traffic engineers are unconvinced of the incremental benefits of ACS over those of well-maintained time-of-day plans. This study identifies three specific deficiencies in the current generation of adaptive-control algorithms. Primarily, the inability to optimize timing in general multiring configurations prevents current adaptive-control algorithms from consistently out-performing properly calibrated dual-ring vehicle-actuated controllers. Limitations in real-time computational capabilities are identified as the main roadblock to overcoming this and other deficiencies. This limitation motivates a novel simulation study focused on real-time computational capabilities of adaptive-control algorithms used in OPAC, PRODYN, ALLONS-D, and COP, the intersection control algorithm of RHODES. The goal is to determine which algorithmic techniques are best suited for extension or reformulation to overcome the identified deficiencies. Benchmarks for vehicle delay performance include Webster's optimized fixed-time control, vehicle-actuated control, and an adaptive fixed-time policy derived from SCOOT. In conclusion, certain aspects of algorithmic techniques from OPAC, PRODYN, and ALLONS-D are unsuitable for much more computationally demanding tasks, including future extension to full optimization of a multiring controller. Also, specific features of the COP-97 and ALLONS-D algorithms present significant advantages in computational complexity and reduced traffic delay, respectively.
Single-Intersection Evaluation of Real-Time Adaptive Traffic Signal Control Algorithms
Transportation Research Record
Transportation Research Record: Journal of the Transportation Research Board ; 1867 , 1 ; 183-192
2004-01-01
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Single-intersection Evaluation of Real-Time Adaptive Traffic Signal Control Algorithms
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