Dynamic speed display signs (DSDS), devices that detect and display a vehicle's current speed back to the driver, have been shown to have a significant speed-reducing effect in temporary applications such as work zones or neighborhood speed watch programs. In this report, researchers examined the effectiveness of DSDS installed permanently in several locations that were experiencing speed-related problems. Seven sites were evaluated, including a school speed zone, two transition speed zones in advance of a school speed zone, two sharp horizontal curves, and two approaches to signalized intersections on high-speed roadways. Data were collected before the DSDS were installed, about one week after installation to determine initial effects of the signs upon vehicle speeds, and again about four months after installation to determine how well the initial speed reductions were maintained. Researchers analyzed average speeds, 85th percentile speeds, percent of the sample exceeding the speed limit and standard deviations of the samples. Also, least square regression analyses between the speed of a vehicle upstream of the DSDS and that vehicle's speed measured again at the DSDS were performed to determine whether the sign affected higher speed vehicles more than lower speed vehicles.
Evaluation of Dynamic Speed Display Signs (DSDS)
2003
110 pages
Report
No indication
English
Transportation & Traffic Planning , Transportation , Transportation Safety , Road Transportation , Changeable message signs , Speed control , Performance evaluation , Traffic control devices , Speed zones , Speed signs , Radar , Work zones , Speed reduction , Intersections , Area traffic control , Display systems , Warning signs , Traffic management , Regression analysis , Effectiveness , Dynamic speed display signs(DSDS)
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Evaluation of Dynamic Speed Display Signs
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|Evaluation of Dynamic Speed Display Signs
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