12.3 Motor Carrier / Trucking and MCS-90

Motor Carrier / Trucking and MCS-90

Businesses that haul goods or passengers for others ("for-hire" motor carriers) are written on the ISO Motor Carrier Coverage Form (CA 00 20), which replaced the older Truckers Coverage Form (CA 00 12). The Motor Carrier form is broader: it contemplates trailer interchange, leased operators, and the federal filing requirements that the basic BAP does not address. Exam questions distinguish the BAP (private/non-trucking risks) from the Motor Carrier form (for-hire interstate trucking).

Motor Carrier symbols differ

The Motor Carrier form uses many of the same symbols but adds trucking-specific ones:

• 41 – Any auto
• 42 – Owned autos only
• 43 – Owned commercial autos
• 45 – Owned autos subject to no-fault
• 47 – Specifically described autos
• 50 – Trailers in the insured's possession under a written trailer interchange agreement

Symbol 50 is unique to trucking: it triggers trailer interchange coverage, physical-damage protection for a trailer the insured does not own but holds under interchange, addressing the swap-and-go nature of intermodal hauling.

The MCS-90 endorsement

The MCS-90 (Endorsement for Motor Carrier Policies of Insurance for Public Liability) is required by the FMCSA under the Motor Carrier Act of 1980 for interstate for-hire carriers. It is NOT coverage in the ordinary sense — it is a suretyship/financial-responsibility guarantee to the public. Key points the exam tests:

• The insurer must pay a judgment for public injury/property damage even if the policy would otherwise exclude the loss (e.g., wrong vehicle, lapsed listing).
• The carrier (insured) must reimburse the insurer for any payment the policy did not actually cover.
• It applies regardless of whether the specific vehicle is described on the policy.

Federal minimum financial responsibility limits

The FMCSA sets minimum public-liability limits by cargo type. The exam wants the headline figures:

The MCS-90 limit is written to satisfy whichever minimum applies to the cargo hauled.

Worked numeric: reimbursement after an excluded loss

A carrier hauling general freight carries a $1,000,000 commercial auto policy with the MCS-90. A driver who was excluded by name causes $820,000 in third-party bodily injury. Because the named-driver exclusion would void coverage, the policy itself pays $0 — but the MCS-90 obligates the insurer to satisfy the public judgment up to the federal $750,000 floor, and here up to the $1,000,000 written limit.

The insurer pays the $820,000 judgment, then bills the motor carrier $820,000 in reimbursement. The MCS-90 protects the public, not the carrier's balance sheet.

Trailer interchange and non-trucking use

Trailer interchange liability addresses physical damage to a trailer held under a written interchange agreement (Symbol 50), and is distinct from non-trucking liability (bobtail) coverage. A leased owner-operator running under a motor carrier's authority is covered by the carrier's policy while hauling for the carrier; bobtail/non-trucking liability (often CA 23 09) covers the tractor when used without a trailer and not in the carrier's business — for example, driving home after dropping a load.

Filings: Form BMC-91 and the public's protection

Interstate for-hire carriers prove financial responsibility by filing Form BMC-91 or BMC-91X with the FMCSA, evidencing the MCS-90 limits. The filing is what allows the carrier to obtain operating authority. Because the MCS-90 cannot be cancelled without 35 days' notice to the FMCSA, the public has continuous assurance of coverage. Exam questions often pair the 35-day cancellation notice with the reimbursement obligation to test whether you understand the endorsement protects third parties, not the insured.

Motor truck cargo and the hauler's property exposure

The Motor Carrier form covers the carrier's liability for vehicles, but the cargo it hauls is a separate exposure insured under Motor Truck Cargo coverage (an inland marine form). Cargo coverage pays for loss to the goods of others while in the insured's care, custody, and control during transit, subject to perils and exclusions (e.g., contraband, refrigeration breakdown unless endorsed). Exam candidates must not confuse cargo (the freight) with physical damage (the truck) — they are distinct coverages with distinct forms.

BAP vs Motor Carrier form decision

Choosing between the BAP and the Motor Carrier form turns on the use of the autos. A landscaper hauling its own equipment uses the BAP. A common carrier hauling other people's goods for hire across state lines must use the Motor Carrier form, file the MCS-90, and meet FMCSA limits. Private carriers transporting their own property in interstate commerce may still face federal filing requirements depending on weight and cargo, so producers should verify operating authority before assuming the simpler BAP applies.

The two forms share the same physical-damage and conditions architecture, so the chief differences a candidate must recall are the symbol set (the 41-50 series adds trailer interchange), the MCS-90 attachment, and the federal limit minimums. Misclassifying a for-hire trucker onto the BAP is a serious producer error: the account would lack the federally required public-liability guarantee and could be denied operating authority.