Specifications

ITE Specification

From the ITE Notice of Intent to Adopt: "This specification sets forth the required performance of traffic signal modules using light-emitting diodes as a light source. It is being issued as Part 2 to the existing ITE Vehicle Traffic Control Signal Head (VTCSH) standard. The Specification has been written to reflect what is currently known about LED technology and the needs of the drivers on our streets and highways."

Date: May 1998
Source: http://www.ite.org/standards/led.htm

Caltrans Specification

The California Department of Transportation specifications include provisions for the minimum intensities permissible under certain temperature ranges. The specification outlines that in certain locations (such as, perhaps, those which experience extremely high temperatures), the use of LED traffic signals may not be advisable. Caltrans also has specifications for pedestrian crossing signals.

Date: October 1997
Source: http://www.dot.ca.gov/hq/traffops/elecsys/led/

U.S. Environmental Protection Agency ENERGY STAR Traffic Signal Specification

Information about the EPA's ENERGY STAR specification for energy-efficient
signals and products that qualify.

Source: http://yosemite1.epa.gov/estar/consumers.nsf/content/traffic_signals.htm

Minnesota Department of Transportation

Information about Mn/DOT's specification for LED traffic signal products.

Source: http://www.dot.state.mn.us/trafficeng/standards/S-led-w.exe

New York State Office of General Services

Describes products meeting the OGS/Department of Transportation program for purchase of efficient traffic signals.

Source: http://www.ogs.state.ny.us/purchase/spg/awards/10254ta.htm