Standard definitions for driving measures and statistics

This paper summarizes Society of Automotive Engineers (SAE) Recommended Practice J2944, Driving Performance Measures and Statistics (draft of February 12, 2013). This Practice was written because commonly used measures and statistics are (1) not named consistently (a lane departure is also called a lane exceedance, lane bust, line crossing, etc.), (2) rarely defined, and (3) when defined, are not defined consistently. Is a lane departure when any tire (or just a front tire) touches the lane marking, covers the lane marking, or goes beyond the lane marking, or is it something else? Uncertainty about what was measured makes comparing driving studies extremely difficult. Therefore, the aim is to require those submitting driving-related papers to conferences (such as this one) and journals to cite this Practice and which version of each measure and statistic was used.