In 2008, the FHWA published the Traffic Signal Timing Manual, providing a basic synthesis of signal timing practices in the United States. The manual covered fundamental signal timing related to intersection design, vehicle detection, and coordination of signalized intersections; but there were many concepts that, due to resource constraints, were not addressed in great detail. Under NCHRP Project 03-103, Kittelson & Associates, Inc., expanded and upgraded this manual, addressing many of the shortcomings. Several goals guided the development of the manual: (1) provide material useful to agencies in documenting their own signal timing policies and practices, (2) facilitate the training of new staff, (3) facilitate implementation of more advanced signal timing concepts where appropriate, (4) include examples that illustrate application of the manual material to real-world intersections and systems, and (5) include references that promote a fuller understanding of topics. During the course of the project, the research team reviewed the pertinent literature (including agency signal timing manuals) and conducted four multi-agency focus groups and a workshop to get feedback on the utility of the 2008 Traffic Signal Timing Manual to typical users. From these efforts, the team identified topics that should be expanded or deepened. The user feedback also greatly influenced the organization of the second edition of the manual to increase its usefulness to practitioners. A PowerPoint presentation providing an overview of this second edition of the Signal Timing Manual can be found on the TRB website by searching on NCHRP Report 812. (Author/publisher)
Samenvatting