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In Myrtle Creek, Oregon, an advanced curve speed warning system installed on I-5 reduced the speed of 76 percent of drivers surveyed.
June 2006 Summary Information In Myrtle Creek, Oregon, the Department of Transportation prepared an evaluation of an advanced curve warning system (ACWS) deployed along a dangerous curve on Interstate 5. This warning system consisted of a radar unit for speed measurement and a dynamic message sign that displayed the speed of the vehicle. The evaluation report prepared in June, 2006 presents the results of a quantitative and qualitative before and after evaluation of a dynamic curve warning system deployed on both the northbound and southbound approach of I-5. Many of these deployments have been directed at improving truck safety for long downgrades or reducing rollover potential on curves. Despite additional warning signs and other modifications, some curves continued to exhibit higher than expected crash frequencies. ITS technologies such as advanced curve warning systems have the potential to enhance the effectiveness of static warning devices.
FINDINGS As part of the qualitative portion of the evaluation, an intercept survey of motorist perceptions of the advance curve warning system was conducted at the closest rest areas on both sides of the interstate. The southbound rest area was approximately 26 miles from the curve and the northbound rest area was approximately 35 miles from the curve. Surveyors were set up at the rest areas over a three day period to recruit willing motorists to fill out a two minute survey. The survey asked questions about recognition, importance, placement, and visibility. The survey indicated:
Goal AreasRelated Metropolitan Integration Links
Link 10: Freeway Management to Traveler Information Typical Deployment LocationsRural Areas KeywordsNone defined
ID: 2008-00517
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