Evaluation of Vehicle Velocity Predictions Using the Critical Speed Formula

950137

02/01/1995

Event
International Congress & Exposition
Authors Abstract
Content
Tire marks left by the vehicle prior to impact, rollover, or other event, are important forensic evidence reconstruction of motor vehicle accidents. Often these tire marks have some curvature that is measured and used to calculate the speed of vehicles prior to the event. This calculation is based on the coefficient of friction of the tire/road interface and the radius of curvature of the vehicle center of gravity (c.g.) path. There is controversy about the validity of this approach. To explore this theory, a test vehicle was driven through a series of maneuvers that produced yaw marks for direct comparison of actual vehicle velocity to the velocity calculated by the critical speed formula. Test results show the critical speed formula is inaccurate for most circumstances and does not correctly describe vehicle limit performance behavior.
Meta TagsDetails
DOI
https://doi.org/10.4271/950137
Pages
11
Citation
Dickerson, C., Arndt, M., Arndt, S., and Mowry, G., "Evaluation of Vehicle Velocity Predictions Using the Critical Speed Formula," SAE Technical Paper 950137, 1995, https://doi.org/10.4271/950137.
Additional Details
Publisher
Published
Feb 1, 1995
Product Code
950137
Content Type
Technical Paper
Language
English