12.3 Motor Carrier / Trucking and MCS-90

The Motor Carrier Coverage Form

Trucking risks are insured under ISO's Motor Carrier Coverage Form (CA 00 20), which replaced the older Truckers Coverage Form (CA 00 12) for most for-hire and private carriers. The Motor Carrier form mirrors the BAP structure but adds provisions addressing trailer interchange, the use of others' trailers, and the special liability exposures of carriers that transport property for others.

A key distinction: a for-hire motor carrier hauls goods belonging to others for compensation, while a private carrier transports its own property. Both can be insured under the Motor Carrier form, but federal filing requirements differ. For-hire interstate carriers are the ones subject to the FMCSA financial-responsibility filings discussed below.

Trailer Interchange Coverage

Motor carriers routinely swap trailers under written trailer interchange agreements. Trailer Interchange coverage insures the carrier's legal liability for damage to a trailer in its possession but not owned by it, while under such an agreement. It is written on a direct-primary basis using the physical damage perils (comprehensive, specified causes of loss, collision) with its own limit and deductible.

Trailer interchange is distinct from the BAP's hired-auto physical damage, which addresses borrowed or leased autos generally rather than the interchange situation specific to trucking. On the exam, the trigger words "written interchange agreement" plus "non-owned trailer" point to Trailer Interchange coverage every time.

Federal Filings: BMC-91 and the MCS-90 Endorsement

Federal law (the Motor Carrier Act of 1980, administered by the FMCSA) requires for-hire carriers crossing state lines to maintain minimum financial responsibility and file proof, typically a Form BMC-91 or BMC-91X. The insurer's promise to satisfy this obligation is embodied in the MCS-90 endorsement (Form MCS-90).

The MCS-90 is a public-protection device, not coverage for the insured. It guarantees payment to injured members of the public even if the policy would otherwise exclude the loss — for example, an unscheduled or improperly classified vehicle. When the insurer pays under the MCS-90 for a loss not otherwise covered by the policy, it has a right of reimbursement from the insured for that payment.

MCS-90 Minimum Limits

The required minimum financial responsibility depends on cargo and weight. The MCS-90 limit applies to the carrier's liability for public bodily injury and property damage, plus environmental restoration, regardless of the policy's stated limit if lower.

Exam Traps

A frequent trap: the MCS-90 does not broaden the named insured's own coverage — it protects the public and creates a reimbursement obligation against the insured. Another trap: the MCS-90 limit is a regulatory floor; the policy's actual coverage limit may be higher and applies first for covered losses.

The MCS-90 responds to negligence in the operation of motor vehicles by the carrier; it does not turn the policy into a cargo policy. Cargo damage (the goods being hauled) is insured separately under Motor Truck Cargo coverage, not the MCS-90. Distinguishing public liability (MCS-90), trailer damage (Trailer Interchange), and goods damage (Motor Truck Cargo) is a recurring three-way exam question.

How the MCS-90 Actually Works

The MCS-90 endorsement is required by the Federal Motor Carrier Safety Administration (FMCSA) for for-hire interstate motor carriers and is best understood as a public-protection guarantee rather than true insurance. It guarantees that the public will be paid for bodily injury and property damage caused by the carrier's negligent operation up to the federal minimum (commonly $750,000 for general freight and $5,000,000 for certain hazardous materials), even if the underlying policy would not respond because the vehicle was unscheduled, the use was excluded, or a condition was breached.

The sting is that the MCS-90 includes a reimbursement clause: if the insurer pays a claim only because the MCS-90 forced it to (a claim the policy itself would have excluded), the insurer may recover that payment from the insured. So the carrier, not the insurer, ultimately bears losses the policy excluded. This is why the MCS-90 protects the public but not the trucker, a point examiners love to test.

Two related trucking coverages complete the picture. Trailer Interchange insurance covers a trucker's legal liability for damage to trailers in its possession but owned by others under interchange agreements, on a direct (physical-damage) basis for fire, theft, collision, and the like. Motor Truck Cargo covers the carrier's liability for loss to the goods it is transporting. Neither is provided by the MCS-90, which addresses only third-party bodily injury and property damage from operating the truck.

Worked scenario: a hazmat hauler causes a $1,200,000 injury while using a vehicle excluded from its policy. The insurer must pay up to the $5,000,000 hazmat minimum under the MCS-90, satisfying the injured public, then invokes the reimbursement clause to recover the full $1,200,000 from the trucking company. The cargo of chemicals being spilled would be a separate Motor Truck Cargo matter, and any borrowed trailer damaged would fall under Trailer Interchange.

Key Takeaways

The MCS-90 is a federally mandated endorsement guaranteeing public payment for a carrier's negligent operation up to federal minimums ($750,000 general, $5,000,000 hazmat) even when the policy would not respond, but its reimbursement clause lets the insurer recover excluded payments from the trucker. Trailer Interchange covers others' trailers in the trucker's possession, and Motor Truck Cargo covers the hauled goods, each separate from the MCS-90.