The FHWA Office of Operations has issued The Signal Timing Manual, the first comprehensive guide to current practices related to traffic signal timing. All the elements of signal timing, from policy and funding considerations to timing plan development, assessment, and maintenance are covered.  The manual is the culmination of research into practices across North America and serves as a reference for a range of practitioners, including traffic engineers, signal technicians, design engineers, teachers, and university students.  It is available at http://www.signaltiming.com