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Abstract:This study is part of an effort by the National Highway Traffic Safety
Administration (NHTSA) to determine the accuracy of the VASCAR-plus speed measurement device. VASCAR-plus is used extensively for speed law enforcement by state and local police. VASCAR-plus calculates average speed using the basic formula: Speed = Distance/Time. The VASCAR-plus manual claims an overall speed measurement accuracy of +_ 1%. This accuracy was recently challenged. This study determined the accuracy of VASCAR-plus time, distance, and speed measurements. Two VASCAR-plus units were electronically tripped (no human operator) to determine the timing accuracy. Six VASCAR certified officers participated in a study to determine VASCAR-plus distance measurement
accuracy. Eight VASCAR certified officers participated in a series of studies to determine VASCAR-plus speed measurement accuracy. The results of these studies show that VASCAR-plus does not have an overall speed measurement accuracy of +_ 1%, but that a + 2 mph upper 90th percentile tolerance limit (95% of the speed errors are
less than + 2 mph) is achievable when the speed measurement is 4 seconds in duration for stationary methods (angular and parking), and is 5 seconds in duration for moving methods (following and approaching from the rear).
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