Evaluating the Performance of Right-Turn-On-Red Operation at Signalized Intersections (with Single and Dual Right-turn Lanes)

Right-turn-on-red (RTOR) is permitted as an effective approach to reduce delay at signalized intersections, especially where there is a high volume of right-turn movements. The conflicting intersection movements of motorized and non-motorized users constitute a critical issue that affects both signal operation and safety. A method is needed to estimate the RTOR flow volume and its effect on delays because current RTOR estimates are not reliable for planning- or operational-level applications. Gaps in the Highway Capacity Manual (HCM) method include: (1) The lack of guidance on whether RTOR should be implemented or not. (2) The current signal timing model that does not adequately reflect the true operational effects of RTOR. (3) No volume estimation model for right-turn delay. The suggested default value for right-turn volume on red is 0 vehicles/hour, due to the difficulty in estimating it without the support of field data. This conservative estimate may lead to inaccurate performance estimations. (4) The pedestrian method that does not consider RTOR flow rate as an input nor does the existing RTOR guidance adequately consider non-motorized users. As a result, agencies throughout the country have applied different RTOR techniques, which may lead to confusion. The development of an HCM method, therefore, will provide guidance on RTOR implementation, and the research findings will assist agencies and practitioners by providing a consolidated body of knowledge on RTOR analysis. The objectives of this research were to (1) evaluate methods for evaluating right-turn-on-red (RTOR) at signalized intersections (right-turn configurations including shared, single, and dual right-turn lanes); (2) develop methods and tools that consider all modes and inform planning and operational decisions; and (3) provide potential modifications to standard references in the Highway Capacity Manual (HCM), NCHRP Report 812: Traffic Signal Manual, and the Manual on Uniform Traffic Control Devices (MUTCD). The final report shall summarize the work performed on the previous tasks, along with significant conclusions and recommendations for implementation. It should include the following at a minimum: (1) Methods for estimating RTOR flow rate; (2) Methods for estimating the effect of RTOR flow rate on approach vehicular delays; (3) Evaluation of any effects to motorized and non-motorized safety that may derive from the proposed methods. (4) Recommendations on motorized and non-motorized criteria regarding the implementation of RTOR; (5) Guidance for operations on both pre-timed and actuated signal controls; (6) Case examples of the proposed method application; and (7) Suggested modifications to standard references in the HCM, MUTCD, ITE: Guidelines for Determining Traffic Signal Change and Clearance Intervals, Traffic Engineering Handbook, and NCHRP Report 812: Traffic Signal Timing Manual, written in an appropriate format for review, revision, and concurrence for future updates and included as an appendix.


  • English


  • Status: Completed
  • Funding: $300000
  • Contract Numbers:

    Project 03-136

  • Sponsor Organizations:

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Project Managers:

    Harwood, Leslie

  • Performing Organizations:

    Iowa State University, Ames

    Institute for Transportation
    2711 South Loop Drive, Suite 4700
    Ames, Iowa  United States  50010-8664
  • Principal Investigators:

    Day, Christopher

  • Start Date: 20190813
  • Expected Completion Date: 20220613
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01669536
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 03-136
  • Files: TRB, RIP, USDOT
  • Created Date: May 21 2018 9:42PM