12.3 Motor Carrier / Trucking and MCS-90

Motor Carrier and Truckers Coverage Forms

Two specialized ISO forms address for-hire trucking exposures: the older Truckers Coverage Form (CA 00 12) and the broader Motor Carrier Coverage Form (CA 00 20). A motor carrier is a business that transports property by auto in commerce, whether for hire or in furtherance of its own business.

These forms add covered-auto symbols and provisions the basic BAP lacks, chiefly to sort out liability when tractors and trailers owned by different parties are combined under a lease.

Trailer interchange and the lease problem

When one carrier hauls a trailer owned by another carrier under a written interchange agreement, trailer interchange coverage insures the trucker's legal liability for direct physical damage to that non-owned trailer in its care, custody, or control.

The motor carrier form uses additional symbols, including symbol 67 (specifically described autos) and symbol 68 (hired autos), plus interchange symbols. A key exam point: liability follows the operating party under federal leasing rules, even though the trailer is non-owned.

The MCS-90 Endorsement

The MCS-90 (Motor Carrier Act Endorsement) is a federally mandated financial-responsibility endorsement, not a coverage grant. Required by the Federal Motor Carrier Safety Administration (FMCSA) under the Motor Carrier Act of 1980, it guarantees that the public can collect a judgment for BI, PD, or environmental restoration arising from a covered vehicle's operation — even if the underlying policy would otherwise exclude the loss.

Minimum limits depend on cargo:

MCS-90 is a public surety, not coverage

The critical, frequently tested distinction: the MCS-90 functions like a surety to the public. If the insurer pays a claim under the MCS-90 that its policy did not actually cover, the insurer has a right of reimbursement from the insured. So the endorsement protects injured members of the public, not the trucker's balance sheet.

Primary vs. non-trucking (bobtail) liability

Who insures the truck depends on whose dispatch it is operating under. While an owner-operator's tractor is hauling freight under a motor carrier's operating authority, the carrier's policy (and the carrier's MCS-90) responds - federal leasing rules make the carrier responsible for the public. When that same tractor is used without a load and not in the carrier's business (driving home, to a repair shop, or on personal errands), the carrier's policy does not apply; the owner-operator needs non-trucking liability, commonly called bobtail coverage, to fill the gap.

Cargo and pollution exposures

The motor carrier and truckers forms can add motor truck cargo coverage, an inland-marine-style protection for the freight the carrier transports for others (a bailee exposure the auto liability and physical-damage sections do not insure). Hazardous-cargo haulers face the higher MCS-90 limits ($1,000,000 for oil/listed hazardous substances; $5,000,000 for explosives, poison gases, and certain hazardous materials). Because the MCS-90 reaches environmental restoration, a fuel-tanker rollover spill that the trucker's own pollution exclusion would bar can still be paid to the public under the endorsement - after which the insurer seeks reimbursement from the trucker. This three-way relationship (public protected, insurer pays, insured reimburses) is the single most important MCS-90 concept on the exam.

Truckers vs. Motor Carrier form distinctions

The older Truckers Coverage Form (CA 00 12) was built around the for-hire trucker hauling others' goods, while the newer Motor Carrier Coverage Form (CA 00 20) is broader and contemplates any business transporting property by auto, including private carriers. Both add trucking-specific symbols and the trailer-interchange concept the basic Business Auto Form lacks.

A key drafting point: when an owner-operator leases their rig to a regulated carrier, the lease and federal regulations generally make the carrier responsible for liability during dispatched operations, so the carrier's policy and MCS-90 control - regardless of who holds title to the tractor or trailer.

Filings: MCS-90 vs. Form E and Form H

Motor carriers face several financial-responsibility filings, and the exam tests their different purposes. The MCS-90 satisfies the federal (FMCSA) public-liability requirement for interstate carriers. State intrastate authority is often evidenced by a Form E (proof of liability filing) and, for cargo, a Form H. These filings notify the regulator that coverage is in force and generally require the insurer to give the regulator advance notice (commonly 30 days) before cancellation.

Producers placing trucking accounts must confirm which filings the carrier's operating authority requires; an unfiled or lapsed filing can shut down the operation even when an underlying policy exists.

Worked MCS-90 reimbursement scenario

A hazardous-materials carrier's tanker overturns, and the spill triggers a $900,000 environmental cleanup and injury claim. The carrier's policy contains a pollution exclusion that would normally bar the loss. Because the carrier hauls a federally regulated commodity, its policy carries the MCS-90 at the $1,000,000 (or $5,000,000 for certain hazardous materials) minimum. The injured public and the cleanup authority collect under the MCS-90 despite the policy's pollution exclusion - the endorsement guarantees payment to the public.

The insurer, having paid a claim its policy did not actually cover, then exercises its right of reimbursement and recovers the $900,000 from the carrier. The carrier's balance sheet, not the insurer's, ultimately bears the uncovered loss, which is the precise mechanism the MCS-90 is designed to enforce and the exam's favorite trucking fact pattern.

Exam Tip: The MCS-90 protects the public, not the trucker - the insurer that pays an otherwise-uncovered MCS-90 claim recovers from the insured. Non-trucking (bobtail) liability covers the rig when off-dispatch and unloaded; cargo coverage (motor truck cargo) insures the freight itself.