AbstractVehicles decelerate between brake application and skid onset. To better estimate a vehicle’s speed and position at brake application, we investigated how vehicle deceleration varied with initial speed during both the pre-skid and skidding intervals on dry asphalt. Skid-to-stop tests were performed from four initial speeds (20, 40, 60, and 80km/h) using three different grades of tire (economy, touring, and performance) on a single vehicle and a single road surface. Average skidding friction was found to vary with initial speed and tire type. The post-brake/pre-skid speed loss, elapsed time, distance travelled, and effective friction were found to vary with initial speed. Based on these data, a method using skid mark length to predict vehicle speed and position at brake application rather than skid onset was shown to improve estimates of initial vehicle speed by up to 10km/h and estimates of vehicle position at brake application by up to 8m compared to conventional methods that ignore the post-brake/pre-skid interval.
Vehicle speed affects both pre-skid braking kinematics and average tire/roadway friction
Accident Analysis and Prevention ; 36 , 5 ; 829-840
2003-08-20
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Vehicle speed affects both pre-skid braking kinematics and average tire-roadway friction
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