12.3 Motor Carrier / Trucking and MCS-90

Insuring the trucking risk

Businesses that transport the goods of others for a fee (for-hire carriers) have exposures the ordinary Business Auto form was not designed for: hauling cargo across state lines, leasing tractors and trailers, and operating under federal authority. ISO publishes two forms for them:

• Truckers Coverage Form (CA 00 12) — the original form, still seen but largely superseded.
• Motor Carrier Coverage Form (CA 00 20) — the current standard, broader and better suited to today's leasing arrangements.

Both use the same covered-auto symbol concept as the Business Auto form, but add provisions for leased autos, owner-operators, and trailer interchange.

The Motor Carrier form was introduced because deregulation blurred the old line between a "trucker" (a for-hire hauler) and a "private carrier" (a business hauling its own goods). The Motor Carrier form covers any motor carrier, for-hire or private, and is therefore the broader, modern choice. It also coordinates better with the federal filings that interstate carriers must make, which is why most trucking accounts are written on CA 00 20 today.

Federal financial responsibility

The Federal Motor Carrier Safety Administration (FMCSA) sets minimum financial-responsibility limits for interstate for-hire carriers. The common tested figures:

These limits protect the public, not the carrier, and are evidenced by filing the appropriate federal endorsement. Memorize the $750,000 baseline; it is a frequent exam fact.

Intrastate carriers are governed by state financial-responsibility rules, which are often lower than the federal floor, so the same truck can face different minimums depending on whether it crosses a state line on a given trip. The carrier proves compliance by maintaining the BMC-91 or MCS-90 filing on record with the FMCSA; letting that filing lapse can pull the carrier's operating authority.

The MCS-90 endorsement

The MCS-90 (Endorsement for Motor Carrier Policies of Insurance for Public Liability) is the most heavily tested trucking concept, and it is misunderstood by candidates because it is not true coverage for the insured.

Key mechanics:

• It is a public-protection guarantee required to meet federal financial-responsibility law.
• If a member of the public obtains a judgment for BI or PD, the insurer must pay up to the federal limit even if the underlying policy would not cover the loss (for example, an excluded auto or an auto the carrier failed to schedule).
• After paying, the insurer is entitled to reimbursement from the insured for any amount it would not otherwise have owed under the policy.

In effect the MCS-90 functions like a surety arrangement: it makes the insurer the public's payer of last resort, then lets the insurer recover from its own insured. Trap: the MCS-90 does not broaden coverage for the insured and does not pay for the insured's own cargo or property — it exists purely to protect injured third parties.

Three facts the exam loves about the MCS-90: it responds only for public bodily injury and property damage (not the carrier's own losses); it can pay even for an auto not listed on the policy if the carrier was operating it under federal authority; and the insurer's reimbursement right runs against the insured, not the injured public, so the victim is always made whole first. Candidates who treat the MCS-90 as ordinary coverage that the insurer simply pays and absorbs miss the entire point of the endorsement.

Trailer interchange and leasing

Trailer interchange coverage insures the insured's legal liability for loss to a trailer the insured does not own but has in its possession under a written trailer interchange agreement (common when carriers swap trailers to keep freight moving). It is physical-damage protection for borrowed trailers, written on a specified-causes-of-loss or comprehensive/collision basis.

Under leasing arrangements, the Motor Carrier form clarifies who is the insured for owner-operators and leased autos: while the leased auto is being used in the lessee carrier's business under a long-term lease, the carrier is typically the insurer of record. Disputes over primary vs. excess coverage between the owner-operator's policy and the carrier's policy are resolved through the form's other insurance condition and any trip lease versus term lease wording.

A practical rule the exam expects: under a long-term (term) lease, the lessee carrier's policy is usually primary while the auto is operated in the carrier's business; under a short trip lease, the owner-operator's own coverage more often stays primary off-duty. The federal Graves Amendment also shields a pure lessor from vicarious liability for a lessee's negligence, so the operating carrier — not the equipment owner — generally bears the loss. These coordination rules exist because the same tractor can run for different motor carriers in a single week.

Trucking Forms and Who Is the Motor Carrier

Trucking risks use the Motor Carrier Coverage Form (CA 00 12) or the older Truckers form. A motor carrier is anyone who transports property by auto for hire or in furtherance of a commercial enterprise. Key wrinkles: Trailer Interchange coverage insures the insured's liability for loss to a trailer in its possession under an interchange agreement (direct primary coverage on the borrowed trailer), and leasing arrangements determine whether the owner-operator or the carrier is the insured under federal leasing rules.

The MCS-90 Endorsement Explained

The MCS-90 is a federally mandated endorsement for interstate motor carriers under the Motor Carrier Act. It is not coverage in the ordinary sense — it is a surety-like financial-responsibility guarantee to the public.

If the carrier's auto causes BI, PD, or environmental damage and the policy would not otherwise pay (e.g., the vehicle was not a scheduled auto, or a pollution exclusion applies), the insurer must still pay the injured public up to the federal minimum (commonly $750,000–$5,000,000 depending on cargo), and then recover that payment from the insured. The exam point: the MCS-90 protects the public, the insurer has reimbursement rights against the insured, and it fills gaps in the underlying policy to satisfy federal law.