The Institute of Transportation Engineers (ITE) is in the process of preparing Guidelines for Determining Traffic Signal Change Intervals: An ITE Recommended Practice (RP). In 1985 ITE published a Proposed Recommended Practice entitled Determining Vehicle Change Intervals that was not ratified to become an RP. Later, in 2001, ITE published the informational report A History of the Yellow and All-Red Intervals for Traffic Signals. In the interim, changes in technology, automated enforcement, the availability of new primary data, further research and the public and professional concern that a defined standard of reference does not exist with regard to this topic have led to the initiative to develop this RP.

This web conference was part of the effort to determine the current state-of-the-practice and to provide the user with an overview of key considerations to determine yellow change and red clearance intervals for traffic signals and their application. The web conference provided an overview of project and key issues that will be addressed in the development of the proposed recommended practice.

• Archived web briefing (10 MB)

Web briefing instructions:

1. Make sure you have Active X Installed and allow pop-ups
2. Click on the briefing link above
3. Select Save from the dialog box that appears
4. Click play.htm