ITE Journal - March 2020 - 31

ƒƒ Emphasis on the use of engineering judgment is woven
throughout the recommend practice.
ƒƒ The report provides the equations for calculation of the yellow
change and red clearance intervals, rather than look up tables,
to emphasize the need for the practitioner to have thorough
understanding of the formulation.
ƒƒ The is a strong theme in the recommended practice for
documentation of decision-making regarding the choice of
yellow change and red clearance intervals.
ƒƒ This report is not intended to cover specific enforcement actions
to address red light running, but does acknowledge that the
range of values for variables used in calculating change intervals
and the range of driver behavior they represent makes zero
tolerance enforcement inappropriate. itej

References
1.	 Guidelines for Determining Traffic Signal Change and Clearance Intervals: A
Recommended Practice of the Institute of Transportation. Washington, DC:
Institute of Transportation Engineers, 2020.
2.	 Determining Vehicle Change Intervals: A Proposed Recommended Practice.
Washington, DC: Institute of Transportation Engineers, 1985.

3.	 ITE Technical Council Task Force 4TF-1. Determining Vehicle Signal Change
and Clearance Intervals. Washington, DC: Institute of Transportation
Engineers, 1994.
4.	 Eccles, K. and H. McGee. A History of the Yellow and All- Red Intervals for
Traffic Signals. Washington, DC: Institute of Transportation Engineers, 2001.
5.	 McGee, H., et al. NCHRP Report 731: Guidelines for Timing Yellow and AllRed Intervals at Signalized Intersections. Washington, DC: Transportation
Research Board of the National Academies, 2012.
6.	 Gazis, D., R. Herman, and A. Maradudin. "The Problem of the Amber
Signal Light in Traffic Flow." Operations Research, Vol. 8, No. 1 (January/
February 1960): 112-132.

Douglas E. Noble, P.E., PTOE (F) is senior director,
management and operations with ITE, where he
responsible for integrating transportation system
management and operations into various ITE products,
programs, and professional development, with a
particular emphasis on traffic signals. He holds a bachelor of science
in civil engineering from Purdue University and master of science in
engineering from the University of Texas. Doug serves as a council
member for the Town of Vienna, VA, USA.

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ITE Journal - March 2020

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