Road Weather Management Program
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Best Practices for Road Weather Management Version 2.0

Title:

Adverse Visibility Information System Evaluation (ADVISE) Interstate 215 Fog Warning System: Final Report

Abstract:

The purpose of the Adverse Visibility Information System Evaluation (ADVISE) was to determine if a fog warning system, installed along Interstate-215 and adjacent to the Jordan River in Salt Lake City, Utah, reduced the mean speeds and/or the variability in speeds between vehicles during low visibility fog events. The results indicate that a typical fog event increases the variability of speeds two to three times over a clear day period. The results also indicate DMS speed advisories reduce variation in vehicle speed by 22 percent. The fog warning system appears to be most influential on exceptionally slow moving vehicles/drivers, which after seeing the messages displayed by electronic signs, increase speeds to the predominant traffic flow speed. The use of a speed advisory was considered successful because it reduced the variability between vehicle speeds, a leading cause of incidents.

Source(s):

University of Utah, Prepared for the Utah DOT Research and Development Division

http://trid.trb.org/view.aspx?id=756940

Date: 2003

Author:

Perrin, Coleman

Keywords:


Visibility
Speed
Speed management
Motorist warning system
Dynamic message sign (DMS)
Intelligent Transportation Systems (ITS)
Traveler information

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