12.3 Motor Carrier / Trucking and MCS-90

The Motor Carrier Coverage Form

Businesses that transport goods or people for hire are motor carriers and are insured on the Motor Carrier Coverage Form (ISO CA 00 20), which replaced the older Truckers Coverage Form (CA 00 12). The form follows the same liability and physical-damage architecture as the Business Auto Coverage Form but adds trucking-specific definitions, symbols, and conditions.

A motor carrier is anyone providing commercial transportation by auto; a for-hire carrier hauls another party's property. Trucking risk is complicated because trucks, trailers, and drivers are constantly combined, swapped, and operated under different authorities (the carrier's federal operating authority versus an owner-operator's lease).

The Motor Carrier form keeps the same numbered-section architecture and symbol logic as the BACF but renumbers and adds symbols for trucking. For example, it includes symbols for all owned autos, specifically described autos, hired autos, and a dedicated symbol for trailers in the insured's possession under a trailer-interchange agreement.

The form also addresses the federally regulated relationship between a motor carrier (holding operating authority) and a private carrier (hauling its own goods). Distinguishing private from for-hire carriage matters because the MCS-90 and FMCSA filing requirements attach to for-hire interstate operations, not to a manufacturer hauling only its own products intrastate.

Trailer Interchange and Bobtail Exposure

Two trucking concepts appear repeatedly on the exam:

• Trailer interchange — when carriers swap trailers under interchange agreements, each is responsible for physical damage to a trailer in its possession. Trailer Interchange Coverage insures damage to a non-owned trailer the insured holds under a written agreement.
• Non-trucking (bobtail) liability — covers an owner-operator's tractor while it is operated without a trailer or not in the business of the motor carrier (e.g., driving home after delivery). "Bobtail" means running the tractor alone; "deadhead" means pulling an empty trailer.

Primary (or trucking) liability applies while the unit is used in the carrier's business; non-trucking liability picks up the personal-use gap so the owner-operator is not bare when off-dispatch.

A related concept is motor truck cargo insurance, which is not part of the auto liability form. Cargo coverage is an inland marine policy that pays for damage to the goods being hauled when the carrier is legally liable as a bailee. Candidates frequently confuse cargo (the freight) with physical damage (the truck) and with liability (third-party injury). Picture three separate buckets: liability pays the injured public, physical damage pays for the insured's own truck, and cargo pays the shipper's freight. The MCS-90, discussed next, sits behind the liability bucket as a public guarantee.

Cargo policies have their own conditions worth knowing: a released-value or per-pound limit may cap recovery, a refrigeration breakdown sublimit may apply to reefer loads, and theft of an entire trailer is often subject to special warranties (alarms, attended-vehicle rules). The carrier's liability for cargo is generally governed by the Carmack Amendment for interstate shipments, which makes the carrier liable for the actual loss to the goods with limited defenses. Knowing that cargo is inland marine — not auto — prevents the common error of expecting the BACF liability limit to pay for spoiled produce.

The MCS-90 Endorsement

The MCS-90 (Motor Carrier Act of 1980 endorsement) is required by the Federal Motor Carrier Safety Administration (FMCSA) for interstate for-hire carriers. It is the single most misunderstood item in trucking insurance.

Key facts:

• The MCS-90 is not coverage — it is a surety/financial-responsibility guarantee that protects the public, not the insured.
• If the policy would normally exclude a loss (wrong vehicle, lapsed coverage, prohibited use), the MCS-90 forces the insurer to pay the injured public member anyway, up to the federal minimum.
• After paying, the insurer is entitled to reimbursement from the insured for any amount it would not otherwise have owed.

The MCS-90 ensures an innocent accident victim is never left uncompensated because of a coverage dispute between insurer and trucker.

Three distinctions are heavily tested. First, the MCS-90 protects the public, never the insured — the insured gets no benefit and in fact must repay the insurer. Second, the MCS-90 responds even if the specific vehicle is not scheduled on the policy, because federal law cares about the carrier's overall financial responsibility, not which unit was listed.

Third, the MCS-90 pays only up to the federal minimum, not the policy's full limit; amounts above the minimum still depend on the underlying policy actually covering the loss. A trucker who lets a filing lapse can find the MCS-90 is the only thing standing between an injured family and an uninsured judgment.

Federal Financial-Responsibility Minimums

The required MCS-90 limit depends on what the carrier hauls. These figures are commonly tested:

These are financial-responsibility floors guaranteed by the MCS-90; carriers usually buy liability limits well above them. A loaded tanker hauling poison gas requires the full $5,000,000 guarantee.

The limits are set by the Motor Carrier Act of 1980 and enforced through FMCSA filings (Form BMC-91 or BMC-91X for property carriers; BMC-32 for cargo on certain commodities). A broker should map the cargo to the right tier: most general-freight haulers need only the $750,000 floor, but a single load of a hazardous substance such as anhydrous ammonia jumps the requirement to $5,000,000.

Intrastate carriers follow state limits, which often mirror or undercut the federal numbers. The takeaway for the exam: match the commodity to the minimum, and remember that passenger carriers are tiered by seating capacity (15-or-fewer at $1,500,000; 16-or-more at $5,000,000).