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Measurement of Vehicle-Roadway Frictional Drag
- Ground Vehicle Standard
Published June 10, 2003 by SAE International in United States
This SAE Recommended Practice provides guidelines for procedures and practices used to obtain and record measurements and to analyze and present results of frictional drag tests of a vehicle with its brakes fully applied at a given roadway location. It is for use at accident sites and test sites and is applicable to straight-line stopping of vehicles such as passenger cars, light trucks and vans under fully braked conditions including locked-wheel skids for vehicles with a conventional braking system and for vehicles with full or partial antilock braking systems (ABS). The average deceleration resulting from a given series of tests is intended to be representative of a frictional drag factor for the conditions under which the test was conducted such as the type of vehicle, type and condition of tires, roadway material and roadway surface conditions. The frictional drag factor is intended to conform to use with the stopping distance formula (Fricke, 1990) as stated in Equation 1. Two methods are included: Stopping Distance Method (measurement of the distance required to bring a vehicle to a complete stop from a known initial speed) and Average Acceleration Measurement (using acceleration measuring devices and data analysis to determine the average drag factor). The Recommended Practice applies to vehicles stopping in a fully braked condition. Values of roadway frictional drag obtained by other means do not necessarily agree or correlate (Lock, et al., 1982) with full vehicle testing and are not recommended.
Data Sets - Support Documents
No Datasets Available
The SAE Accident Investigation and Reconstruction Practices (AIRP) Technical Standards Committee is dedicated to the development of recommended practices and information reports in the fields of accident reconstruction/analysis.STRUCTURE: The committee is composed of a series forums dealing with broad issues dealing with accident investigation and reconstruction. The forums are also based for the Task Forces that develop the J-standards. Current forums and task forces include Collision Damage and Classification, J224; Truck Damage Classification, J1301; Early Acquisition and Preservation of Information, J1674; Accident Reconstruction and Terminology, J1675; Generalized Damage Measurement, J1676; Event Data Records; Motor Vehicle Fire Investigation Advisory Group; Vehicle-Road Friction Measurement, J2505; Uncertainty in Accident Reconstruction; Accident Reconstruction Technology Collection, ARDC2007.
|940722||Uncertainty in Accident Reconstruction Calculations|
|940918||Analysis of Accelerometer Data for Use in Skid-Stop Calculations|
|ASTM E 445/E 445M||This document is not part of the subscrption.|
|ASTM E 503/E 445M||This document is not part of the subscrption.|
|ASTME274||This document is not part of the subscrption.|
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|ASTME456||This document is not part of the subscrption.|
|ASTME503||This document is not part of the subscrption.|
|ASTMF403||This document is not part of the subscrption.|
|ASTMF811||This document is not part of the subscrption.|
|J299_200901||Stopping Distance Test Procedure|
|J670E_197607||Vehicle Dynamics Terminology|
|TSB003_199905||Rules for SAE Use of SI (Metric) Units|