00978544

Component

https://doi.org/10.3141/1867-21

http://scholar.google.com...elby&publication_year=2004

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 outperforming 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.

This paper appears in Transportation Research Record No. 1867, Freeway Operations and Traffic Signal Systems 2004.

00978523

English

p. 183-192

2004

Transportation Research Record

0309094615

Figures (2) ; References (19) ; Tables (1)

Adaptive control; Algorithms; Deficiencies; Evaluation and assessment; Real time data processing; Traffic signal control systems

Highways; Operations and Traffic Management; I73: Traffic Control

TRIS, TRB, ATRI

Sep 23 2004 12:00AM

• ANOTHER VIEW OF TRUCK LANE RESTRICTIONS
• ASSESSMENT OF THE IMPACT OF INCIDENTS NEAR BOTTLENECKS: STRATEGIES TO REDUCE DELAY
• BENEFIT ASSESSMENT OF IMPLEMENTING WEATHER-SPECIFIC SIGNAL TIMING PLANS BY USING CORSIM
• COMPREHENSIVE EVALUATION OF FEEDBACK-BASED FREEWAY RAMP-METERING STRATEGY BY USING MICROSCOPIC SIMULATION: TAKING RAMP QUEUES INTO ACCOUNT
• CONFIGURATION OF TRAFFIC-RESPONSIVE PLAN SELECTION SYSTEM PARAMETERS AND THRESHOLDS: ROBUST BAYESIAN APPROACH
• CROSS-CORRELATION TRACKING TECHNIQUE FOR EXTRACTING SPEED FROM CAMERAS UNDER ADVERSE CONDITIONS
• ESTIMATION OF TRAVEL TIMES ON URBAN FREEWAYS UNDER INCIDENT CONDITIONS
• EVALUATION OF TOLL PLAZA PERFORMANCE AFTER ADDITION OF EXPRESS TOLL LANES AT MAINLINE TOLL PLAZA
• FIELD TESTING FOR AUTOMATED IDENTIFICATION OF TURNING MOVEMENTS AT SIGNALIZED INTERSECTIONS
• INCLEMENT WEATHER AND TRAFFIC FLOW AT SIGNALIZED INTERSECTIONS: CASE STUDY FROM NORTHERN NEW ENGLAND
• METHOD FOR PRIORITY-RANKING AND EXPANDING FREEWAY SERVICE PATROLS
• METHODOLOGY FOR MEASURING RECURRENT AND NONRECURRENT TRAFFIC CONGESTION
• MINNESOTA'S NEW RAMP CONTROL STRATEGY: DESIGN OVERVIEW AND PRELIMINARY ASSESSMENT
• MODELING IMPACT OF RAMP METERING QUEUES ON DIAMOND INTERCHANGE OPERATIONS
• NEW ALGORITHMS FOR FILTERING AND IMPUTATION OF REAL-TIME AND ARCHIVED DUAL-LOOP DETECTOR DATA IN I-4 DATA WAREHOUSE
• OBSERVED DYNAMIC TRAFFIC FEATURES ON FREEWAY SECTION WITH MERGES AND DIVERGES
• ONLINE TRAVEL TIME ESTIMATION WITHOUT VEHICLE IDENTIFICATION
• OPTIMAL DETECTOR LOCATION FOR BUS SIGNAL PRIORITY
• OPTIMIZATION OF TIME-OF-DAY BREAKPOINTS FOR BETTER TRAFFIC SIGNAL CONTROL
• RED CLEARANCE INTERVALS: THEORY AND PRACTICE
• RESEARCH NEEDS FOR WEATHER-RESPONSIVE TRAFFIC MANAGEMENT
• SAMPLING STRATEGIES FOR PROBE-VEHICLE-BASED FREEWAY INCIDENT DETECTION ALGORITHMS
• SCOOT AND INCIDENTS: PERFORMANCE EVALUATION IN SIMULATED ENVIRONMENT
• SIMPLE WORKSHEET METHOD TO EVALUATE EMERGENCY VEHICLE PREEMPTION AND ITS IMPACTS ON SAFETY
• SYSTEMATIC IDENTIFICATION OF FREEWAY BOTTLENECKS
• TRAINING NEURAL NETWORKS TO DETECT FREEWAY INCIDENTS BY USING PARTICLE SWARM OPTIMIZATION