GUIDANCE FOR USING RED LIGHT CAMERAS
Federal Highway AdministrationNational Highway Traffic Safety Administration
March 20, 2003
LIST OF TABLES
RED LIGHT CAMERA PROGRAM IMPLEMENTATION
Traffic Signal Yellow Times
The MUTCD and ITE recommended practice on the lengths of yellow interval times provide adequate and proper direction to practitioners. Yellow times should be established in accordance with the MUTCD (17) guidelines and the ITE (7) informational report for methods for calculating yellow time intervals.
Changes in the yellow times after red light cameras are in place and
operational will affect the number of photographed violations, increasing
the number of violations when yellow times are shortened and reducing
the number of violations when yellow times are lengthened. Where changes
in the yellow times at intersections with red light cameras are required
as the result of updated speed surveys or other factors, the changes should
be clearly described in public information announcements. When yellow
times are shortened, only warning notices should be issued for violations
that are recorded for a reasonable amount of time after the change.