12.3 Motor Carrier / Trucking and MCS-90

The Trucking Forms

Long-haul and for-hire trucking exposures are written on specialized ISO forms. The Truckers Coverage Form (CA 00 03) was the original. The Motor Carrier Coverage Form (CA 00 12) is now the common choice because it serves both private carriers (hauling their own goods) and for-hire carriers (hauling others' goods for pay) and builds in trailer-interchange handling.

Trailer Interchange

Carriers routinely swap trailers under written interchange agreements so a tractor can keep moving while a trailer is loaded elsewhere. Trailer interchange coverage insures the insured's legal liability for physical damage to a non-owned trailer in its possession under such an agreement. Comprehensive, specified causes of loss, or collision bases can apply. It does not cover the insured's owned trailers - those are insured as autos.

The MCS-90 Endorsement

Interstate for-hire carriers must prove financial responsibility under 49 CFR Part 387, enforced by the FMCSA (Federal Motor Carrier Safety Administration). The MCS-90 endorsement attaches to the auto liability policy and acts as a surety-like guarantee: the insurer will pay a final judgment to a member of the injured public for negligence in operating a motor vehicle, even if the specific loss would otherwise be excluded or uninsured under the policy.

Crucially, the MCS-90 protects the public, not the insured. After paying, the insurer may recover from the insured any amount it would not have owed but for the endorsement.

The BMC-91 / BMC-91X is the FMCSA filing evidencing this coverage; a surety bond (BMC-85) is the alternative. Note that intrastate carriers follow their own state minimums, which may differ from these federal tiers.

Motor Truck Cargo - the Missing Piece

Neither liability, the MCS-90, nor trailer interchange insures the freight a carrier hauls for others. Motor truck cargo coverage is an inland marine line that insures the carrier's legal liability for loss to property of others in transit. It is rated by commodity and per-vehicle limit and is frequently required by shippers and brokers before a load is tendered.

The exam pairs this with the care, custody, or control exclusion: liability forms exclude property in the insured's care, so cargo coverage fills that gap.

Form and Filing Selection

Worked scenario: An interstate hauler of ordinary freight rear-ends a car, injuring the driver, while the carrier had let its physical-damage premium lapse and a policy condition arguably voided coverage. Because the MCS-90 is attached, the insurer must still pay the injured motorist up to the $750,000 federal minimum, then seek reimbursement from the carrier. The damaged car driver is protected; the carrier bears the ultimate cost.

Private vs. For-Hire and the Scope of the MCS-90

The distinction between carrier types drives form and filing choices. A private carrier moves its own property as part of another business (a grocery chain's fleet); a for-hire carrier transports the goods of others for compensation and is the carrier that typically needs FMCSA authority and the MCS-90 filing.

• The MCS-90 applies to negligence in the operation of a motor vehicle, including vehicles not even listed on the policy schedule, because its purpose is public protection rather than indemnifying the insured.
• It is not triggered for intrastate-only operations; those follow state financial-responsibility law.
• It does not convert the policy into cargo or physical-damage coverage - the carrier still buys those separately.

Reimbursement Mechanics

Because the MCS-90 is a guarantee to the public, the carrier remains the party ultimately responsible. If the insurer pays a $600,000 judgment to an injured motorist under the MCS-90 but the loss fell outside normal policy terms, the insurer has a contractual right to recover that $600,000 from the carrier. Exam writers test this reimbursement right alongside the dollar tiers, so memorize both the $750K/$1M/$5M figures and the public-not-insured principle together.

Trucking Forms and the Federal Filing Maze

Motor carriers (for-hire trucking) use either the Business Auto form or the Motor Carrier Coverage Form (CA 00 12), which adds trucking-specific definitions (trailer interchange, Truckers legacy concepts). The single most tested item is the MCS-90 endorsement.

The MCS-90 is a federally mandated public-protection endorsement required of interstate motor carriers under the Motor Carrier Act of 1980 / FMCSA rules. It guarantees that the public injured by a covered truck is paid the federal minimum financial responsibility limit — commonly $750,000 for general freight, $1,000,000 for oil/certain hazardous materials, and $5,000,000 for the most dangerous materials.

How the MCS-90 Actually Operates

The MCS-90 is not ordinary coverage — it is a surety-like promise to the public. If the underlying auto policy would not pay (e.g., the vehicle was not a scheduled auto, or an exclusion applies), the insurer still pays the injured public up to the federal minimum, then has a right of reimbursement from the insured for any amount it would not otherwise have owed.

Worked trap: a carrier hauls hazardous waste with an unscheduled tractor and injures a motorist. The auto policy denies because the tractor was not a covered auto, but the MCS-90 forces the insurer to pay the injured motorist up to $5,000,000, and the insurer then bills the carrier for the full amount. Examiners want you to know the MCS-90 protects the public and gives the insurer reimbursement rights against its own insured — the opposite of normal coverage.

Trailer interchange coverage (physical damage to trailers in the insured's care under a written interchange agreement) is the other commonly tested trucking add-on.