In Myrtle Creek, Oregon, an advanced curve speed warning system installed on I-5 reduced the speed of 76 percent of drivers surveyed.
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:
- Most drivers (76 percent) slowed down in response to the dynamic message signs that display their speed on each approach. Approximately half of the motorists surveyed who did not slow down indicated that they were already traveling below the advised speed.
- 79 percent of drivers noted the sign was placed in an adequate location.
- 84 percent of drivers thought the sign information aided in the safe navigation of the curves.
- The ACWS was effective in reducing the mean speeds of passenger cars and trucks by approximately three mi/h for the southbound direction and two mi/h for the northbound direction.
- The distribution of vehicle speeds was statistically different with a lower number of vehicles in the higher speed bins.
Author: Bertini, Robert L., et al.
Published By: Oregon DOT and U.S. DOT Federal Highway Administration
Prepared by the Portland State University Department of Civil & Environmental Engineering for the Oregon DOT and U.S. DOT
Source Date: June 2006
Other Reference Number: FHWA-OR-RD-06-13URL: http://www.oregon.gov/ODOT/TD/TP_RES/docs/Reports/MyrtleCreek.pdf
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