Research & Publications

Effect of Drag Factor Uncertainty on Speed Estimates                  By Jinger Fuller

How much does uncertainty in the drag factor actually affect a calculated speed?

This research examines the effect of drag factor variation on speed estimates across multiple surfaces, distances, and drag-factor ranges using Monte Carlo analysis. The study evaluates how changes in assumed drag factors influence calculated speeds and provides practical reference information for collision reconstruction professionals.

The research is intended to help reconstructionists better understand uncertainty, variability, and the practical effect of drag-factor selection on speed calculations.

Topics include:

• Drag factor variability

• Speed calculations

• Monte Carlo analysis

• Statistical uncertainty

• Asphalt, concrete, gravel, grass, mud, snow and ice

• Multiple distance and speed ranges

• Practical reference tables for reconstructionists

• Large scale matrix with drag factor variability in 0.05 increments for every 10 ft

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