12.3 Motor Carrier / Trucking and MCS-90

The Motor Carrier Coverage Form (CA 00 20)

When a business hauls property or passengers for others for hire across state or interstate routes, the Business Auto form is usually replaced by the Motor Carrier Coverage Form (ISO CA 00 20) or the older Truckers Coverage Form (CA 00 12). The Motor Carrier form adapts the BAP for federal regulation under the FMCSA (Federal Motor Carrier Safety Administration) and the older ICC/MCS rules.

The Motor Carrier form uses the same covered auto symbols with additions, most importantly Symbol 67 (all owned autos plus trailers and equipment you do not own while attached) and trailer-interchange concepts. It also addresses the unique exposure of pulling non-owned trailers under trailer interchange agreements.

Trailer interchange and Section coverage

• Trailer Interchange Coverage insures the policyholder's legal liability for physical damage to a non-owned trailer in their possession under a written interchange agreement—comprehensive, specified causes of loss, or collision can each be selected per trailer.

• The form clarifies who is an insured when a tractor (truck) and trailer owned by different parties are coupled—the tractor's liability policy generally follows the unit.

• Bobtailing / deadheading: when an owner-operator drives a tractor with no trailer attached ("bobtail") or with an empty trailer not under dispatch ("deadhead"), the carrier's filed policy may exclude that use—non-trucking-use ("bobtail") liability is bought separately. This is a heavily tested gap because the trucker is between loads and not technically in the carrier's business.

Watch the leasing trap: under federal leasing rules, a carrier that leases an owner-operator's rig is treated as the statutory employer, so the carrier's policy (and MCS-90) follows the placarded vehicle even though the driver owns it.

The MCS-90 Endorsement

The MCS-90 (Motor Carrier Act Endorsement) is a federally mandated financial-responsibility endorsement, NOT ordinary insurance coverage. It is required of interstate for-hire motor carriers to guarantee that the public is paid for bodily injury, property damage, and environmental restoration caused by negligent operation, even if the policy would otherwise exclude the loss.

Critical exam points:

• The MCS-90 is a suretyship-like public protection. If the insurer pays a claim under the MCS-90 that the underlying policy did not actually cover, the insurer has a right of reimbursement from the insured.

• It responds only to public (third-party) claims, not to the carrier's own property.

• It does not increase the policy limit between insurer and insured; it guarantees the statutory minimum to the public.

• The MCS-90 does not require a specific covered auto to be involved—courts have applied it to vehicles not even on the policy schedule, because its purpose is public protection, not asset insurance. It cannot be cancelled without 35 days' written notice to the FMCSA, a frequent exam fact.

A related federal filing is the Form BMC-91/91X, the insurer's certificate of financial responsibility filed with the FMCSA evidencing the MCS-90 limits are in force. Intrastate-only carriers are governed by state financial-responsibility law instead, so the federal minimums above may not apply.

Federal minimum financial-responsibility limits

Federal minimums under the MCS-90 depend on what is hauled:

Trap: The familiar $750,000 figure applies to general freight. Candidates often wrongly pick $750,000 for hazmat—hazmat is $1,000,000 or $5,000,000. Also remember the MCS-90 limit is the public-protection floor; the policy's own CSL may be higher.

MCS-90 vs. the Underlying Policy — Reading the Difference

Candidates routinely confuse the MCS-90 with the trucker's actual insurance. They operate on different planes:

Quick Answer: The MCS-90 is a public-protection guarantee, not coverage for the trucker. If it pays a loss the policy excluded, the insurer recovers that money from the motor carrier.

Bobtail, Non-Trucking Use, and the Statutory-Employer Trap

The biggest real-world gap for owner-operators is non-trucking use (bobtail) liability. While a tractor is being driven without a trailer and not under dispatch, the carrier's filed policy and MCS-90 may not respond, so the owner-operator buys a separate bobtail/non-trucking-use policy. Conversely, under federal leasing rules the carrier is the statutory employer of a leased owner-operator, so the carrier's policy and MCS-90 follow the placarded vehicle even though the driver owns the rig and even if the specific unit is not on the schedule.

Examiners pair these two ideas: in-dispatch use falls on the carrier (statutory employer); off-dispatch bobtail use falls on the owner-operator's separate policy. Knowing which side of the dispatch line the loss occurs on is the key to the answer.