12.3 Motor Carrier / Trucking and MCS-90

Motor Carriers vs. Truckers

A motor carrier is a business that transports property by motor vehicle for hire, in commerce. Because trucking involves leased power units, owner-operators, trip leases, and trailers swapped between carriers, ISO replaced the older Truckers Coverage Form with the Motor Carrier Coverage Form (CA 00 20), which better addresses these exposures. The Motor Carrier form retains the covered-auto symbol system but uses some trucking-specific symbols and adds coverage for interchanged trailers.

Key distinctions from the standard Business Auto form:

• It contemplates autos leased to or from others (trip leases, long-term leases).
• It defines trailer interchange exposures.
• It coordinates with federal financial-responsibility filings.

Trailer Interchange Coverage

Under interchange agreements, carriers swap loaded trailers without exchanging tractors. Trailer Interchange coverage insures the motor carrier's legal liability for physical damage to a trailer that is in its possession under a written trailer-interchange agreement but is not owned by the insured. It is written on a comprehensive, specified-causes, and/or collision basis with its own limit and deductible.

The MCS-90 Endorsement

The MCS-90 endorsement is required by the Motor Carrier Act of 1980 and administered by the Federal Motor Carrier Safety Administration (FMCSA). It is one of the most misunderstood items on the exam.

• The MCS-90 is a surety / financial-responsibility guarantee to the public, NOT a coverage grant to the insured.
• It obligates the insurer to pay an injured member of the public for bodily injury, property damage, and environmental restoration arising from the negligent use of any motor vehicle, even if the policy would otherwise exclude the loss (for example, an unscheduled or non-covered vehicle).
• After the insurer pays under the MCS-90, the motor carrier must reimburse the insurer for any amount the insurer would not have been liable for under the policy itself.

In short: the MCS-90 ensures the public is made whole first; the insurer then subrogates against its own insured.

Federal Minimum Financial Responsibility

The required minimum depends on the cargo:

Exam trap: The MCS-90 limit is the statutory minimum even if the policy limit is higher or lower; it is a floor of public protection. Candidates often wrongly call the MCS-90 a coverage that benefits the trucker — it does not. It benefits the injured public, and the carrier owes reimbursement.

How It Fits Together

A motor carrier typically buys a Motor Carrier Coverage Form with high CSL liability, attaches the MCS-90 to satisfy the federal filing, and may add Trailer Interchange and Motor Truck Cargo (an inland marine form) to cover the freight itself, since auto liability excludes care, custody, or control of cargo.

Filings: Form MCS-90 vs. Form BMC-91

Candidates should distinguish the endorsement from the filing. The MCS-90 is the endorsement attached to the policy. The Form BMC-91 (or BMC-91X) is the public liability surety certificate filed with the FMCSA by the insurer, certifying that the carrier meets the financial-responsibility minimum. Intrastate carriers may have separate state filings. The presence of an MCS-90 does not change the policy limit; it simply guarantees the public will be paid up to the statutory floor regardless of policy exclusions.

Symbols Unique to the Motor Carrier Form

The Motor Carrier Coverage Form uses a parallel set of symbols. For example, certain editions designate hired autos and trailers in the insured's possession under interchange agreements with their own symbols, and a symbol for autos the insured does not own but leases to others. Because trucking operations frequently lease equipment in and out, getting the right symbol on each coverage line is critical; a leased-in tractor written under the wrong symbol can leave the carrier without liability protection.

Owner-Operators and Trip Leases

A recurring trucking exposure is the owner-operator who leases their tractor and services to a regulated carrier. Under federal leasing rules, the carrier's authority and insurance generally control the operation while the owner-operator is under dispatch (the truck displaying the carrier's placard).

When the owner-operator drives for personal use or for a different carrier ("bobtail" or "deadhead"), specialized non-trucking / bobtail liability coverage is needed, because the carrier's policy responds only while the unit is in the carrier's business. Confusing these on/off-dispatch periods is a classic claim dispute and a tested concept.

The MCS-90 Endorsement and Why It Differs from Insurance

Federal law (under the FMCSA / MCS-90 endorsement) requires interstate motor carriers of property to maintain minimum public liability limits — commonly $750,000 for general freight and $1,000,000–$5,000,000 for hazardous materials. The MCS-90 is not coverage in the ordinary sense; it is a federally mandated surety-like endorsement that guarantees the public will be paid for BI/PD even if the policy would otherwise exclude the loss.

Trap: the MCS-90 pays the injured public first, then lets the insurer recover from the motor carrier any amount it paid that the underlying policy did not actually cover — it is a public-protection guarantee, not extra coverage for the insured.