FMCSA-regulated motor carrier insurance for owner-operators and small fleets.

FMCSA requires interstate motor carriers to file proof of public liability coverage — typically a BMC-91 or BMC-91X filing — with the agency before authority activates. The minimum financial responsibility limit is set by federal regulation and depends on what you haul: general freight has one floor, hazardous materials a higher floor, and the most dangerous placarded commodities a higher floor still. Most shippers and brokers contract for limits well above the federal floor, so the limit your authority needs and the limit your customers want are usually two different conversations.

The MCS-90 is a federal endorsement that backstops your auto liability policy when a covered public-liability or pollution event leaves a third party uncompensated. It is not coverage for you — it pays the injured public first and the insurer then seeks reimbursement from your operation. If you ever see the MCS-90 activated, you owe the carrier back. Treat it as a regulatory safety net for the public, not as additional protection for your truck or your business.

Trucking auto liability covers your tractor when it is operating under dispatch — pulling a trailer or moving between loads on motor-carrier business. Non-trucking (bobtail) liability covers the tractor when it is off-dispatch — driving home, running personal errands, or repositioning outside motor-carrier use. Most primary auto liability policies specifically exclude off-dispatch operation, so without bobtail an at-fault loss while off-dispatch falls to the driver personally. Owner-operators leased to a motor carrier almost always need both.

A motor carrier’s CSA (Compliance, Safety, Accountability) BASIC scores are one of several inputs underwriters use to gauge loss likelihood. Sustained elevated scores in Unsafe Driving, HOS Compliance, or Crash Indicator categories raise renewal pricing and narrow the panel willing to quote. A single bad roadside inspection rarely moves a renewal materially; a pattern across inspections does. Underwriters also weigh recent at-fault accidents, any FMCSA interventions, and how the operation has documented its response to prior findings.

The lien holder typically dictates the floor. Most lenders require physical damage equal to the loan balance or appraised value, whichever is higher, with both collision and comprehensive coverage in force for the duration of the loan. If your tractor is paid off, you set the limit — newer equipment carries a higher actual cash value and earns more premium savings from raising the deductible than older equipment does. Trailer physical damage is a separate line and follows the same logic, often with a different deductible structure.

A DOT compliance audit reviews your safety management systems, hours-of-service records, driver qualification files, drug and alcohol program, and vehicle maintenance records. The audit itself does not change your policy, but findings can. A conditional or unsatisfactory safety rating reduces the carriers willing to renew you and triggers a federal review of your authority. Address findings in writing within the audit response window and keep the documentation — underwriters will ask about both the findings and the response at your next renewal.