Tire Mark Striations: Sensitivity and Uncertainty Analysis

Abstract

Previous work demonstrated that the orientation of tire mark striations can be used to infer the braking actions of the driver [1]. An equation that related tire mark striation angle to longitudinal tire slip, the mathematical definition of braking, was presented. This equation can be used to quantify the driver's braking input based on the physical evidence. Braking input levels will affect the speed of a yawing vehicle and quantifying the amount of braking can increase the accuracy of a speed analysis. When using this technique in practice, it is helpful to understand the sensitivity and uncertainties of the equation. The sensitivity and uncertainty of the equation are explored and presented in this study. The results help to formulate guidelines for the practical application of the method and expected accuracy under specified conditions. A case study is included that demonstrates the analysis of tire mark striations deposited during a real-world accident.

The Relationship Between Tire Mark Striations and Tire Forces

“…J. Trans. Safety / Volume 4, Issue 1 (April 2016) the mechanism that creates the marks. The second analysis method uses the slip angle equation to determine steering.…”

Striated Tire Yaw Marks—Modeling and Validation

“…The usefulness of such marks for accident analysis depends obviously on their quality and clarity, which affect the uncertainty in the measurement of the geometric parameters. Beauchamp et al in [15] explore the sensitivity and uncertainty of the s x equation. They prove that at α = 5 • , the striations will change over 70 degrees between no braking and maximum braking, while at α = 85 • , less than 2 degrees separate no braking and maximum braking.…”