Why Power Unit Count Is the Most Underused Segmentation Variable in Commercial Trucking Insurance
Most carriers segment by state and class code. Adding power-unit count as a primary segmentation variable reveals fleet populations that are invisible in traditional analyses.
Commercial trucking insurance segmentation typically starts with state and class code. You write commercial auto in Texas, or you focus on long-haul in the Midwest. These are useful categories, but they mask significant variation in fleet size, risk profile, and buying behavior.
Power-unit count — the number of trucks a carrier operates — is a segmentation variable that cuts across geography and class. A 3-truck owner-operator in Florida has more in common with a 3-truck owner-operator in Ohio than with a 50-truck fleet in Florida. Their coverage needs, buying patterns, loss profiles, and distribution channels are all shaped more by fleet size than by state.
DOT Intel uses power-unit bands as a core segmentation layer. We group fleets into bands (1-3, 4-9, 10-25, 26-99, 100+) that correspond to meaningful differences in how insurance is bought and sold. Each band represents a distinct market with its own competitive dynamics.
For carriers, this segmentation reveals where your appetite aligns with actual fleet populations. You may have strong appetite for the 10-25 range but be barely present in states where that segment is growing.
What can power-unit bands show, and what do they miss?
Power units offer one way to compare carriers of similar reported fleet size. Select bands before examining results, show the count in each band, and use the same snapshot period for every geography. A band can reveal where an agency's current book differs from the available carrier population. It cannot, by itself, explain coverage need or predict loss experience.
Check the underlying carrier record when a band affects a prospecting or underwriting decision. Reported power units can change, and a carrier near a boundary may move bands between snapshots. Combine fleet size with operating area, cargo, authority, and the insurer's current rules. Document which fields are observed and which are DOT Intel groupings so a reader can reproduce the comparison.
Public record: FMCSA SAFER Company Snapshot. This source explains the underlying fields; the workflow interpretation is DOT Intel editorial analysis.
Evidence and update history
Published March 15, 2026. Last materially updated October 17, 2026. This page separates observed transportation records from DOT Intel calculations and modeled signals.
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