How are the Safety Measurement System (SMS) percentile ranks calculated?
SMS evaluates the safety of individual motor carriers by considering all safety-based roadside inspection violations, not just out-of service violations, as well as State-reported crashes, using 24 months of performance data. SMS assesses motor carriers’ safety performance in each of the seven Behavior Analysis and Safety Improvement Categories (BASICs): Unsafe Driving, Fatigued Driving (Hours-of-Service), Driver Fitness, Controlled Substances and Alcohol, Vehicle Maintenance, Cargo-Related, and Crash Indicator. SMS calculates a measure for each BASIC by combining the time- and severity-weighted violations/crashes (more recent violations are weighted more heavily), normalized by exposure, which is a statistical calculation that allows SMS to make a fair comparison between carriers with different levels of activity (e.g. a hybrid of the number of Power Units per Vehicle Miles Traveled or the number of relevant inspections). Applying a similar approach to what was used in SafeStat, the S
Related Questions
- If my Behavior Analysis and Safety Improvement Categories (BASICs) Safety Measurement System (SMS) percentile ranks go up what will happen?
- How are the Safety Measurement System (SMS) scores calculated? How often will it be updated and how far back do violations count?
- Why does the Safety Measurement System (SMS) hold carriers responsible for drivers errors, such as speeding?
