Safety Measurement System (SMS) Methodology: Behavior Analysis and Safety Improvement Version 3.12 Category (BASIC) Prioritization Status Methodology Revised August 2021 Document Revised August 2021 Table of Contents Introduction ...................................................................................................................... 1-1 Purpose of this Document ...................................................................................................... 1-2 Design of the SMS BASIC Prioritization Status ................................................................... 2-1 Description of the BASICs ....................................................................................................... 2-1 Data Sources ........................................................................................................................... 2-2 On-Road Design Features ....................................................................................................... 2-4 Violation Severity ................................................................................................................... 2-4 Adjudicated Citations ............................................................................................................. 2-4 Crash Severity ......................................................................................................................... 2-5 Not Preventable Crashes ........................................................................................................ 2-5 Time Weights .......................................................................................................................... 2-5 Normalization ......................................................................................................................... 2-5 Segmentation ......................................................................................................................... 2-6 Safety Event Groups ............................................................................................................... 2-6 Data Sufficiency ...................................................................................................................... 2-6 Percentile Rank ....................................................................................................................... 2-6 Investigation Features ............................................................................................................ 2-7 Acute and Critical Violations .................................................................................................. 2-7 BASIC Prioritization Status ...................................................................................................... 2-8 BASIC Intervention Thresholds ............................................................................................... 2-8 SMS BASIC Prioritization Status Methodology .................................................................. 3-1 Unsafe Driving BASIC Prioritization Status Assessment ......................................................... 3-1 On-Road Performance ............................................................................................................ 3-1 Intervention Thresholds ......................................................................................................... 3-5 Investigation Results .............................................................................................................. 3-6 Crash Indicator BASIC Prioritization Status Assessment – Not Publicly Available ................. 3-6 On-Road Performance ............................................................................................................ 3-6 Intervention Thresholds ....................................................................................................... 3-10 HOS Compliance BASIC Prioritization Status Assessment .................................................... 3-10 On-Road Performance .......................................................................................................... 3-10 August 2021 i Intervention Thresholds ....................................................................................................... 3-12 Investigation Results ............................................................................................................ 3-12 Vehicle Maintenance BASIC Prioritization Status Assessment ............................................. 3-13 On-Road Performance .......................................................................................................... 3-13 Intervention Thresholds ....................................................................................................... 3-15 Investigation Results ............................................................................................................ 3-15 Controlled Substances/Alcohol BASIC Prioritization Status Assessment ............................. 3-16 On-Road Performance .......................................................................................................... 3-16 Intervention Thresholds ....................................................................................................... 3-18 Investigation Results ............................................................................................................ 3-18 HM Compliance BASIC Prioritization Status Assessment – Not Publicly Available .............. 3-18 On-Road Performance .......................................................................................................... 3-18 Intervention Thresholds ....................................................................................................... 3-20 Investigation Results ............................................................................................................ 3-21 Driver Fitness BASIC Prioritization Status Assessment ......................................................... 3-21 On-Road Performance .......................................................................................................... 3-21 Intervention Thresholds ....................................................................................................... 3-23 Investigation Results ............................................................................................................ 3-23 Insurance/Other Indicator Prioritization Status Assessment – Not Publicly Available ........ 3-24 Investigation Results ............................................................................................................ 3-24 SMS Improvement Process ............................................................................................... 4-1 Appendix A ................................................................................................................................. A-1 Appendix B ................................................................................................................................. B-1 August 2021 ii List of Tables Table 2–1. Impact of Adjudicated Citation Result on Violation in SMS ...................................... 2-5 Table 2–2. BASIC Intervention Thresholds ................................................................................. 2-8 Table 2–3. Passenger Carrier Intervention Threshold Definition ............................................... 2-9 Table 2–4. HM Intervention Threshold Definition ...................................................................... 2-9 Table 3–1. VMT per Average PU for Combination Segment ....................................................... 3-4 Table 3–2. VMT per Average PU for Straight Segment ............................................................... 3-4 Table 3–3. Safety Event Groups for Unsafe Driving BASIC: Combination Segment .................... 3-5 Table 3–4. Safety Event Groups for Unsafe Driving BASIC: Straight Segment ............................ 3-5 Table 3–5. Intervention Thresholds for the Unsafe Driving BASIC ............................................. 3-5 Table 3–6. Crash Severity Weights for Crash Indicator BASIC .................................................... 3-7 Table 3–7. VMT per Average PU for Combination Segment ....................................................... 3-8 Table 3–8. VMT per Average PU for Straight Segment ............................................................... 3-8 Table 3–9. Safety Event Groups for the Crash Indicator BASIC: Combination Segment ............. 3-9 Table 3–10. Safety Event Groups for the Crash Indicator BASIC: Straight Segment ................... 3-9 Table 3–11. Intervention Thresholds for the Crash Indicator BASIC ......................................... 3-10 Table 3–12. Safety Event Groups for the HOS Compliance BASIC ............................................ 3-12 Table 3–13. Intervention Thresholds for the HOS Compliance BASIC ...................................... 3-12 Table 3–14. Safety Event Groups for the Vehicle Maintenance BASIC ..................................... 3-15 Table 3–15. Intervention Thresholds for the Vehicle Maintenance BASIC ............................... 3-15 Table 3–16. Safety Event Groups for Controlled Substances/Alcohol BASIC ............................ 3-17 Table 3–17. Intervention Thresholds for the Controlled Substances/Alcohol BASIC ................ 3-18 August 2021 iii Table 3–18. Safety Event Groups for the HM Compliance BASIC ............................................