12.3 Motor Carrier / Trucking and MCS-90

The Motor Carrier Coverage Form

Long-haul and for-hire trucking exposures are written on the Motor Carrier Coverage Form (CA 00 20), which replaced the older Truckers Coverage Form. It functions like the BACF but adds provisions for trailer interchange, hauling others' property, and the federal filings required of interstate carriers.

A motor carrier is anyone who transports property by auto in a commercial enterprise. The form distinguishes a private carrier (hauls its own goods) from a for-hire carrier (hauls others' goods for a fee), and the for-hire interstate carrier triggers federal financial-responsibility rules.

Trailer Interchange and Non-Trucking Use

Two trucking-specific concepts appear on exams:

• Trailer Interchange Coverage — direct (physical damage) coverage for trailers in the insured's possession but owned by others under a written interchange agreement. It covers the insured's legal liability for damage to that borrowed trailer.
• Non-Trucking Use (Bobtail) Coverage — for owner-operators leased to a motor carrier; it covers the tractor when driven without a trailer and not in the carrier's business (e.g., driving home). The carrier's policy covers business use; bobtail fills the personal-use gap.

Trap: Bobtail is not the same as deadhead/non-trucking liability for an empty trailer. Bobtail = no trailer attached, off dispatch.

The MCS-90 Endorsement

The MCS-90 (Motor Carrier Act Endorsement) is required by the Federal Motor Carrier Safety Administration (FMCSA) for interstate for-hire carriers under the Motor Carrier Act of 1980. It is not insurance in the normal sense — it is a surety-like public-protection guarantee.

Under the MCS-90, the insurer agrees to pay a judgment to an injured member of the public even if the policy would otherwise not cover the loss (e.g., the auto was not scheduled, or a pollution exclusion applies). The insurer then has the right to reimbursement from the insured for any amount it pays that the underlying policy did not actually cover.

MCS-90 Minimum Limits

Federal minimum financial responsibility under the MCS-90 depends on cargo:

Trap: The MCS-90 only responds to public liability (BI/PD to the public and environmental restoration) — it does not cover cargo, the insured's own property, or workers' compensation. And because the insurer can seek reimbursement, the MCS-90 protects the public, not the carrier's balance sheet.

Motor Carrier vs. Truckers Form

ISO replaced the older Truckers Coverage Form (CA 00 12) with the broader Motor Carrier Coverage Form (CA 00 20), though some carriers still reference truckers terminology. The Motor Carrier form is designed for businesses that transport property for hire and addresses the layered liability that arises when tractors, trailers, and drivers belong to different parties.

The form's covered-auto symbols differ from the BACF. Symbol 61 is the motor-carrier equivalent of "any auto," and additional symbols isolate owned, hired, and trailer exposures. The exam rarely asks the exact symbol numbers but does test that the Motor Carrier form, not the BACF, is the correct base form for a for-hire trucker.

How the MCS-90 Actually Operates — Worked Example

The MCS-90 is not coverage in the ordinary sense; it is a surety-style guarantee to the public. If a trucker's underlying policy excludes a loss (say, the truck was hauling a load the policy did not contemplate), the insurer must still pay an injured member of the public up to the federal minimum, then seek reimbursement from the insured for any amount it would not otherwise have owed.

Example: a for-hire carrier causes $400,000 of bodily injury while operating outside its policy terms. The policy alone would pay nothing, but the MCS-90 forces the insurer to pay the $750,000 federal minimum cap on this loss up to $400,000 to the public, then recover that $400,000 from the trucker. Exam questions reward candidates who recognize the reimbursement right — the endorsement protects the public, not the insured.

Cargo, Bobtail, and the BMC-91 Filing

For-hire truckers face exposures the BACF ignores. Motor truck cargo insurance covers the freight the trucker hauls for others (the trucker's liability as a bailee of the cargo), and is usually written as inland marine, not auto. Non-trucking liability ("bobtail") covers an owner-operator's tractor when it is driven without a trailer and not in the business of the motor carrier — closing the gap left when a leased-on driver uses the rig personally.

Federal authority is documented by filing the MCS-90 with the FMCSA, evidenced for the public by form BMC-91. The exam ties these together: a trucker hauling general freight interstate must show at least $750,000 in financial responsibility, rising to $1,000,000 for oil and certain hazardous materials and $5,000,000 for the most dangerous substances. Match the cargo to the limit and the filing to the agency.

Quick Limit Recall

Lock in the three federal cargo tiers because the exam tests them verbatim: $750,000 for general (non-hazardous) freight, $1,000,000 for oil and many hazardous materials, and $5,000,000 for the most hazardous substances such as explosives and certain gases. The MCS-90 guarantees these amounts to the public regardless of policy exclusions, then lets the insurer recover from the trucker.