Comprehensive Safety Analysis 2010 Safety Measurement System (SMS) Methodology, Version 2.1 Revised December 2010
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Summary
This document outlines the methodology for Version 2.1 of the Safety Measurement System (SMS), a tool developed by the Volpe National Transportation Systems Center for the Federal Motor Carrier Safety Administration (FMCSA). The SMS supports the Compliance, Safety, Accountability (CSA) Initiative, aiming to reduce commercial motor vehicle crashes, fatalities, and injuries by identifying and monitoring unsafe behaviors among motor carriers and drivers. Building on the earlier SafeStat system, the SMS provides a more granular assessment of safety performance to enable targeted interventions rather than generalized compliance reviews. The SMS evaluates entities across six Behavior Analysis and Safety Improvement Categories (BASICs): Unsafe Driving, Fatigued Driving (Hours-of-Service), Driver Fitness, Controlled Substances/Alcohol, Vehicle Maintenance, and Cargo-Related. It also includes a Crash Indicator. Data are sourced from the Motor Carrier Management Information System (MCMIS), incorporating roadside inspection violations, state-reported crash records, and motor carrier census data. The system distinguishes between the Carrier Safety Measurement System (CSMS) and the Driver Safety Measurement System (DSMS). Methodologically, the SMS calculates a measure for each BASIC by summing time-weighted and severity-weighted violations. Violations are assigned severity weights from 1 to 10 based on crash risk, with additional weight for out-of-service orders. Time weights prioritize recent events, with violations older than 24 months excluded. Measures are normalized by exposure, such as the number of inspections or carrier size (power units and vehicle miles traveled), and carriers are segmented by vehicle type to ensure fair comparisons. The system assigns percentile ranks from 0 to 100 to each BASIC and the Crash Indicator, comparing an entity’s performance against peers with similar safety event volumes. Carriers exceeding specific percentile thresholds and meeting data sufficiency standards are identified as deficient and subject to the CSA Intervention Process. The SMS improves upon SafeStat by utilizing all safety-based inspection violations rather than just out-of-service violations, applying risk-based severity weightings, and assessing individual drivers in addition to carriers. This allows for surgical interventions targeting specific behavioral issues. The significance of the SMS lies in its ability to provide continuous monitoring of safety performance, supporting more efficient and effective enforcement. By identifying specific unsafe behaviors, the system enables tailored interventions and informs the Safety Fitness Determination process. The SMS empowers stakeholders, including carriers, shippers, and insurers, to make safety-based business decisions. It addresses National Transportation Safety Board recommendations by linking poor on-road performance directly to safety fitness determinations, thereby enhancing accountability for both carriers and drivers.
Key finding
The SMS methodology replaces the SafeStat system by utilizing risk-based violation weighting, time-decay factors, and normalization techniques to generate percentile rankings for six specific behavioral categories and crash history, enabling more targeted enforcement interventions.
Methodology
dataset
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
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| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 3 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 19 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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- Empirical Findings: crash risk outcomes