Evaluation of traffic signal displays for protected/permissive left-turn control.

This report recommends traffic signal displays for protected/permissive left-turn control. The recommendations are based on a comprehensive evaluation of the safety and effectiveness of alternative traffic signal displays and phasing through laboratory and field studies. These studies are summarized in the report and detailed information on them is available on the enclosed CD-ROM, CRP-CD-35. Traffic signal designers and operators will find the report informative, as will those interested in human factors research. A key audience for the report will be those responsible for the "Manual on Uniform Traffic Control Devices" (MUTCD) because it is intended that the recommendations be considered for the next edition. (Author/publisher) A CD-ROM accompanies NCHRP Report 493, "Evaluation of Traffic Signal Displays for Protected/Permissive Left-Turn Control." It contains the working papers developed from comprehensive laboratory and field studies on the safety and effectiveness of alternative traffic signal displays for protected/permissive left-turn control. This report may be accessed by Internet users at http://gulliver.trb.org/publications/nchrp/nchrp_rpt_493.pdf