Normalizing crash risk of partially automated vehicles under sparse data (pre-print)

By correcting for roadway usage differences between the Autopilot and active safety only data, much of the crash reduction seen by vehicles using Autopilot appears to be explained by lower crash rates experienced on freeways. While the raw crash rate shows an average 43% reduction in crash rate for Autopilot compared to active safety only, this improvement is only 10% after controlling for different rates of freeway driving. Correcting for age demographics likewise produced an11% increase in the estimated crash rate.