A study of travelers on Snoqualmie Pass, WA found that DMS can decrease mean driving speeds and reduce accident severity.
Human laboratory experiments and traveler surveys were used to check the results of the modeling effort. Driver reaction to roadway variables and travel advisory information was measured using: a compact car driving simulator equipped with auditory and visual effects, 51 representative test subjects who actually drove on Snoqualmie Pass, and 444 mail-back surveys from area travelers.
In general, the modeling effort and simulator experiments estimated the impact of travel advisory information on mean driving speeds, mean driving speed deviation, and the number of accidents and accident severity in the study area.
Travel advisory information on DMS signs can decrease mean driving speeds and reduce accident severity; however, if traveler information is provided to some, but not all drivers (or DMS sites), mean driving speed deviations can increase and temper the effect of lower mean speeds.
Author: Ulfarsson, Gudmundur F., et al.
Published By: Washington State Transportation Commission and the U.S. DOT
Prepared by the University of Washington for the Washington State Transportation Commission and the U.S. DOT
Source Date: December 2001
EDL Number: 13610
Other Reference Number: Project No. T9903, Task 16URL: http://ntl.bts.gov/lib//jpodocs/repts_te/13610.html
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Intelligent Transportation Systems > Road Weather Management > Traffic Control > Variable Speed Limits
Intelligent Transportation Systems > Road Weather Management > Information Dissemination > Internet/Wireless/Phone
Intelligent Transportation Systems > Road Weather Management > Information Dissemination > Dynamic Message Signs
Intelligent Transportation Systems > Freeway Management > Lane Management > Variable Speed Limits
Typical Deployment Locations
VSL, DMS, CMS, VMS, Changeable Message Signs, Variable Message Signs, managed lanes, RWIS