SCOOT ADAPTIVE SIGNAL CONTROL : AN EVALUATION OF ITS EFFECTIVENESS OVER A RANGE OF CONGESTION INTENSITIES

This paper compares the performance of adaptive control using the Split, Cycle and Offset Optimization Technique (SCOOT) relative to a fixed-time plan based control. A four-intersection test corridor is modeled using the Corridor Simulation (CORSIM) program. Five sets of traffic flows were generated testing the corridor at increasing volumes from a volume to capacity (v/c) ratios of 0.7 through 1.1. The corridor was evaluated with pre-timed, actuated-coordinated actuated-uncoordinated, and fully actuated strategies to determine the most optimal one. This was used in comparing SCOOT performance relative to the optimal signal timing. The corridor is controlled by SCOOT through the SCOOT-CORSIM Interface which allows an actual SCOOT system to get detector information from CORSIM and provide signal timing to CORSIM. Results of the test corridor show that SCOOT reduces delay by 8% at the 0.7 v/c, which increases to 13% at a v/c of 0.9. Minimal improvements are observed as the corridor approaches saturation. This indicates that substantial savings are available with SCOOT during under-saturated flow conditions and SCOOT helps postpone the onset of congestion, but SCOOT operates much like a fixed time system once flows reaches saturation. Two real-world corridors were tested with SCOOT reducing overall corridor delays by 14% and 11%. Further, this paper shows the importance of validating the SCOOT system properly. The simple activation of SCOOT, without any validation, provides a 219% increase in corridor delays over the fixed time plan. After validation, the results show a delay reduction of 8% over fixed time control. The validation findings dispel the idea that adaptive control systems are "plug and play"

• Supplemental Notes:
  • Publication Date: 2003. Transportation Research Board, Washington DC. Remarks: Paper prepared for presentation at the 82nd annual meeting of the Transportation Research Board, Washington, D.C., January 2003. Format: CD ROM
• Corporate Authors:

  University of California, Berkeley

  California PATH Program, Institute of Transportation Studies
  Richmond Field Station, 1357 South 46th Street
  Richmond, CA  United States  94804-4648

  California Department of Transportation

  1120 N Street
  Sacramento, CA  United States  95814

  University of California, Berkeley

  Department of Electrical Engineering and Computer Sciences
  Berkeley, CA  United States  94720
• Authors:
  • Jhaveri, Chintan S
  • PERRIN, JOSEPH
  • Martin, Peter T
• Conference:
  • Transportation Research Board 82nd Annual Meeting
  • Location: Washington DC, United States
  • Date: 2003-1-12 to 2003-1-16
• Date: 2003

Language

• English

Media Info

• Pagination: 28 p.

Subject/Index Terms

• TRT Terms: Adaptive control; Technology assessment; Traffic congestion; Traffic control; Traffic signals
• Subject Areas: Operations and Traffic Management;

Filing Info

• Accession Number: 00962491
• Record Type: Publication
• Source Agency: UC Berkeley Transportation Library
• Files: PATH, STATEDOT
• Created Date: Sep 2 2003 12:00AM