Trucking Terms Guide

Insurance / Coverage

Primary Liability in trucking

Short answer: Liability coverage for bodily injury or property damage caused by the truck in covered operations.

Plain-English explanation

Primary liability is the trucking insurance that covers bodily injury and property damage to third parties caused by the motor carrier during the operation of the truck. FMCSA requires interstate carriers to maintain minimum limits — $750,000 for most dry freight, $1 million for hazmat, $5 million for certain hazmat loads.

Insurance terms should be matched to the policy, endorsement, certificate, limit, and exclusion language. A short definition cannot confirm coverage for a specific loss or load.

Why it matters in trucking

Every broker packet will ask for proof of primary liability on the certificate of insurance. If the carrier's policy lapses, expires, or falls below the required limit, the broker cannot legally tender freight to that carrier. It is the first policy any shipper or broker looks at.

Coverage questions are easier before dispatch than after a claim. If the load, trailer, cargo value, or operating status is unusual, clarify the wording early.

Example in real use

A carrier's insurance agent sends a COI to the broker showing $1,000,000 primary auto liability with the carrier listed as the named insured. When the policy renews, the agent issues a new certificate so the broker's file does not show a lapse.

Common mistakes or confusion

  • Confusing primary liability with cargo insurance — primary liability covers damage to other people and their property, not the freight on the truck.
  • Sending an expired certificate and assuming the broker can still tender loads while the renewal is in process.
  • Not listing the broker as certificate holder or additional insured when the broker's packet requires it.

Related terms

Motor Truck Cargo Coverage for freight being hauled by the carrier, subject to exclusions and limits. Physical Damage Coverage for damage to the insured truck or trailer itself, subject to policy terms. General Liability Business liability coverage for certain non-auto claims, depending on the policy. Bobtail Insurance Coverage for a tractor operated without a trailer in certain situations. Non-Trucking Liability Liability coverage for certain personal or non-business use of a truck when not under dispatch. Occupational Accident Accident coverage often used by independent contractors, not the same as workers compensation.

Commonly confused with

Motor Truck Cargo Coverage for freight being hauled by the carrier, subject to exclusions and limits.

Related guides

Truck Insurance Terms is the best next place to keep learning this topic.

Sources and last updated

Insurance definitions are reviewed against FMCSA minimum coverage requirements and NAIC consumer insurance glossary. Coverage details should be confirmed against the actual policy. See the sources page.

Last updated: 2026-05-10