Best Practices for Road Weather Management Version 2.0
Title:
Summary: Travelaid
Abstract:
This report discusses the effectiveness of using dynamic message signs (DMS) and in-vehicle traffic advisory systems (IVU) on a mountainous pass (Snoqualmie Pass on Interstate 90 in Washington state) for changing driver behavior. As part of this project, variable message and variable speed limit information were placed along a 61-km segment of I-90 between North Bend, Wash., and Cle Elum, Wash., where I-90 passes over the Cascade mountains through Snoqualmie Pass. The signs, which were implemented during the winter of 1997-98, provided weather and roadway information to motorists with the intention of reducing the number and severity of accidents. An analysis of accidents on Snoqualmie Pass was conducted with historical accident data. Several accident models were used to estimate accident frequencies severity. The report reviews the analysis of speed data over Snoqualmie Pass and reports on lane-mean speeds and deviations. A laboratory experiment was conducted on the use of an in-vehicle system and DMS. A driving simulator was used for this study. Mean speed and deviation from the mean speed were analyzed, as was the effectiveness of the systems over each 4.68-km stretch. The effect of DMS on the relationship between mean speeds and speed deviations was analyzed.
Source(s):
Summary Report for Project T9903, Task 16 prepared by Washington State Transportation Center of University of Washington
http://www.wsdot.wa.gov/research/reports/fullreports/511.2.pdf
Date: 2002
Author:
Ulfarsson, et al.
Keywords:
Driver behavior
Speed
Variable Speed Limit (VSL)
Traveler information
Crashes
Safety
Weather information
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