SIGNAL TIMING IMPROVEMENT PRACTICES

This synthesis will be of interest to traffic engineers, public officials, and others interested in developing improved traffic signal timing procedures. Information has been assembled on traffic signal timing software, resources required for timing, procedures for single intersections and coordinated systems, pedestrian intervals, and fine-tuning solutions. Traffic engineers need to know the comparative requirements and effectiveness of alternative traffic signal timing techniques. This report of the Transportation Research Board describes these techniques, presents the general principles for application, including source material for more detailed information, and discusses the issues associated with traffic signal timing alternatives. It should be noted that, while traffic engineers frequently use standards developed by the American Association of State Highway and Transportation Officials, the Federal Highway Administration, or other agencies in making engineering judgments, they are always well advised to protect themselves by carefully supporting the bases of their decisions with factual findings and documenting the reasons for the decisions.