FHWA Traffic Signal Timing Manual, First Edition

KAI developed the first edition of the Signal Timing Manual for the Federal Highway Administration, as part of a national effort to improve the performance of signalized intersections. The manual addresses specific aspects of traffic signals including planning, design, operations, and maintenance, with proper consideration for all modes. It also discusses the operational features of the standard traffic signal controller such as detector layout and timing, coordination parameters, and advanced applications. Clearance intervals are addressed in the Manual, providing a summary of the approaches used by practitioners, without recommendation of a particular methodology.

KAI worked with the University of Maryland and the Texas Transportation Institute in support of the effort.