12.3 Motor Carrier / Trucking and MCS-90

The Motor Carrier Coverage Form

Businesses that transport goods or people for hire are insured on the Motor Carrier Coverage Form (ISO CA 00 20), which replaced the older Truckers Coverage Form. A motor carrier is anyone providing transportation by auto in the furtherance of a commercial enterprise. The form mirrors the BACF but adds trucking-specific provisions:

• Trailer interchange — liability for trailers of others in your possession under a written interchange agreement.
• Broadened named-insured and permissive-use rules reflecting owner-operators leasing to carriers.
• Coverage that follows the lease arrangement between the carrier and owner-operators.

Motor carriers hauling property in interstate or foreign commerce are regulated by the Federal Motor Carrier Safety Administration (FMCSA) and must demonstrate financial responsibility — this is where the MCS-90 enters.

The MCS-90 Endorsement

The MCS-90 (Endorsement for Motor Carrier Policies of Insurance for Public Liability) is a federally mandated endorsement under the Motor Carrier Act of 1980. It guarantees that an injured member of the public is paid even if the policy would otherwise exclude the loss (e.g., the rig was hauling a non-scheduled commodity, or coverage lapsed for nonpayment). The MCS-90 is a surety-like safety net for the public, not coverage for the insured.

Minimum financial-responsibility limits

These are the public-liability minimums the carrier must prove; cargo (property of others) is a separate filing.

How the MCS-90 Reimbursement Works

The critical feature: if the insurer pays a claim under the MCS-90 that the policy itself would not have covered, the insured must reimburse the insurer for everything paid, including defense. The endorsement protects the public, not the trucker — it converts the policy into a financial-responsibility guarantee.

Exam trap: Candidates assume the MCS-90 adds coverage for the insured. It does not. It pays third parties when the policy excludes the loss, then the insurer recovers from the insured. Distinguish it from the Form MCS-90B (passenger carriers) and the BMC-91/91X filing, which is the certificate filed with FMCSA evidencing the MCS-90 is in place.

Worked example

A carrier's policy excludes hauling certain chemicals. A spill injures a motorist who wins $900,000. Because the carrier filed an MCS-90 with a $1,000,000 limit, the insurer pays the motorist $900,000. The insurer then bills the carrier the full $900,000 plus defense, because the underlying policy excluded the haul.

Trailer Interchange and Motor Truck Cargo

Two coverages frequently bundled with motor-carrier policies are commonly tested.

Trailer Interchange insures the insured's legal liability for loss to trailers of others in the insured's possession under a written interchange agreement. It is physical-damage coverage on the other party's trailer — comprehensive, specified causes, or collision — subject to a limit per trailer and a deductible. It applies only while the trailer is in the carrier's care under the agreement.

Motor Truck Cargo (MTC) is inland marine coverage for the freight (property of others) being hauled. The MCS-90 does not cover cargo; a separate cargo policy or a BMC-34 cargo filing handles it. Federal cargo financial responsibility historically required $5,000 for household goods movers.

Distinguishing the filings

Exam trap: Cargo is never part of the MCS-90. If a question asks what protects the freight, the answer is Motor Truck Cargo, not the MCS-90 or trailer interchange.

Federal Filings and the Public-Protection Purpose

Interstate for-hire motor carriers must file proof of financial responsibility with the FMCSA. The Form MCS-90 rides on the policy; the BMC-91 / 91X is the certificate filed evidencing public-liability coverage, and the BMC-34 / BMC-83 evidences cargo financial responsibility. All exist to protect the public, not the carrier, and the insurer retains a right of reimbursement from the carrier for anything paid that the policy itself excluded.

Trap: Cargo is never part of the MCS-90. The freight itself is protected by Motor Truck Cargo (inland marine) and the BMC-34 filing, not by the public-liability endorsement.

Lease/Owner-Operator Coverage and the Reimbursement Mechanic

Motor-carrier policies must address owner-operators who lease their rigs to a carrier. Coverage follows the lease arrangement: while the owner-operator hauls under the carrier's authority, the carrier's policy responds; when operating independently ("bobtail"/"deadhead"), separate non-trucking liability coverage applies. The MCS-90 pays the public when the policy excludes a loss, then the insurer reimburses itself from the carrier.

Trap: The MCS-90 is a public-protection guarantee, not added coverage for the insured. After it pays an excluded loss, the carrier owes the insurer every dollar plus defense - candidates who think the MCS-90 broadens the insured's own coverage are wrong.