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How many vehicles count for the UCR tier?

Count power units operated in interstate commerce — owned or leased, straight trucks and tractors. Exclude trailers, intrastate-only vehicles, dollies, and vehicles below the CMV threshold. Leased equipment counts toward the lessee's tier, not the lessor's.

The UCR tiers are: Tier 1 (0-2 power units), Tier 2 (3-5), Tier 3 (6-20), Tier 4 (21-100), Tier 5 (101-1,000), Tier 6 (1,001+). The count is taken from the carrier's most recent MCS-150 or the equivalent state-of-record vehicle count.

Power units include straight trucks, tractors, and CMV-grade vehicles operated in interstate commerce. Excluded: trailers, dollies, converter gear, intrastate-only vehicles, and any vehicle below the CMV threshold (typically 26,001 lbs GVWR).

Leased-on owner-operators: the truck counts toward the lessee's (the carrier's) UCR tier. The owner-operator does not file separate UCR for that vehicle. If the OO has their own MC and runs other trucks under their own authority, those trucks count toward their own UCR tier.

A common mistake: counting trailers. A carrier with 8 owned trucks and 12 trailers is Tier 3 (8 power units), not Tier 4 (20 total). Trailers never count toward UCR.

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