['Compliance, Safety, Accountability CSA']
['Compliance, Safety, Accountability CSA']
11/14/2025
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The SMS uses segmentation within the Unsafe Driving and Crash Indicator Behavior Analysis and Safety Improvement Categories (BASICs) to account for carrier differences by placing the carrier population into two groups based on the types of vehicles operated. Carriers are grouped by the following two vehicle types/operations:
- Combo segment — Combination trucks/motorcoach buses constituting 70 percent or more of the total power units (PUs) (vehicles).
- Straight segment — Straight trucks/other vehicles constituting more than 30 percent of the total PUs (vehicles).
The segmentation of motor carriers means that companies who have fundamentally different types of vehicles/operations are not compared to each other.
['Compliance, Safety, Accountability CSA']
['Compliance, Safety, Accountability CSA']
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