12.3 Motor Carrier / Trucking and MCS-90
Key Takeaways
- The Motor Carrier Coverage Form (CA 00 20) is ISO's modern form for for-hire and private carriers; the Truckers Form (CA 00 12) is the older version.
- Trailer interchange covers liability for others' trailers under written agreements; bobtail/non-trucking coverage fills owner-operator gaps.
- The MCS-90 is a public financial-responsibility guarantee, not insurance for the insured, mandated by the Motor Carrier Act of 1980 and enforced by FMCSA.
- When the MCS-90 pays a non-covered claim, the insurer has a right of reimbursement against the insured.
- Minimum limits: $750,000 general freight, $1,000,000 oil/hazardous substances, $5,000,000 most hazmat.
Trucking and Motor Carrier Forms
ISO offers two specialized forms for businesses that haul goods for others:
- The Truckers Coverage Form (CA 00 12) — older form for trucking operations.
- The Motor Carrier Coverage Form (CA 00 20) — broader, modern form now favored by ISO; covers private and for-hire carriers and adapts better to federal definitions.
A motor carrier is anyone providing transportation of property or passengers by auto for hire. These forms address exposures the basic BACF does not handle well, such as trailer interchange (liability for damage to trailers of others in the insured's possession under a written interchange agreement) and the distinct insured status of owner-operators.
Trailer Interchange and Non-trucking Use
- Trailer Interchange coverage insures the carrier's legal liability for loss to a borrowed/swapped trailer, on a direct-primary or excess basis depending on the agreement.
- Non-trucking liability ("bobtail") — when an owner-operator drives the tractor without a trailer and not under dispatch (e.g., driving home), the motor carrier's policy may exclude that use; bobtail/non-trucking endorsements fill the gap.
The MCS-90 Endorsement
The MCS-90 (Motor Carrier Endorsement) is the most heavily tested federal item. It is mandated by the Motor Carrier Act of 1980 and enforced by the FMCSA (Federal Motor Carrier Safety Administration) for carriers operating in interstate commerce.
Key points the exam loves:
- The MCS-90 is NOT insurance for the insured — it is a surety-like financial-responsibility guarantee to the public. It guarantees that an injured member of the public will be paid even if the policy would otherwise not cover the loss (e.g., wrong vehicle, lapsed schedule).
- If the insurer pays a judgment under the MCS-90 that the underlying policy did not actually cover, the insured must reimburse the insurer for everything paid, including defense costs.
- It applies to public liability — bodily injury, property damage, and environmental restoration from a covered accident.
Required Minimum Limits (Public Liability)
| Cargo type | Minimum financial responsibility |
|---|---|
| General freight (non-hazardous), GVWR ≥ 10,001 lbs | $750,000 |
| Oil / certain hazardous substances | $1,000,000 |
| Hazardous materials (most dangerous classes) | $5,000,000 |
| For-hire passenger carriers (16+ seats) | $5,000,000 |
| For-hire passenger carriers (15 or fewer seats) | $1,500,000 |
Worked example. A trucker hauling general freight in interstate commerce causes a $900,000 public-injury judgment while driving a tractor that was inadvertently left off the policy schedule. The personal-auto-style exclusion would normally deny the claim, but the MCS-90 forces the insurer to pay the public claimant the full $900,000 (within the $750,000 statutory floor the insurer must guarantee — and up to the policy limit shown). The insurer then has a right of reimbursement against the insured for sums it would not otherwise have owed.
Which statement best describes the MCS-90 endorsement?
A for-hire interstate carrier hauls general (non-hazardous) freight in a vehicle with a GVWR over 10,001 pounds. What is the minimum public-liability financial responsibility required?
Motor Carrier and Trucking Coverage Forms
Trucking risks are written on the Motor Carrier Coverage Form (CA 00 20), which replaced the older Truckers form and accommodates both for-hire carriers and private carriers. It addresses exposures unique to trucking, such as trailers, the use of others' equipment, and the distinction between operating under a carrier's authority and operating for personal use. The form coordinates coverage among the owner of a tractor, the carrier leasing it, and the operator, which is essential because a single rig may be owned, leased, and driven by three different parties.
Trailer Interchange and Non-Trucking Use
Trailer Interchange coverage insures the carrier's legal liability for damage to trailers in its possession under a written interchange agreement, a common arrangement where carriers swap trailers. Non-Trucking Use coverage (often called bobtail coverage) protects an owner-operator while driving the tractor without a trailer and not under dispatch for the carrier, filling the gap when the carrier's policy does not apply because the truck is not being used in the carrier's business. Distinguishing operation under dispatch (carrier's policy) from personal/bobtail use (non-trucking coverage) is a frequent exam point.
The MCS-90 Endorsement
The MCS-90 is a federally mandated endorsement, required for interstate motor carriers of property by the Motor Carrier Act, that guarantees a minimum level of public protection. It is not insurance for the insured but a financial-responsibility surety: if the carrier's policy would not otherwise pay a judgment for public bodily injury or property damage (because of an exclusion or because the vehicle was not scheduled), the insurer must still pay the injured public up to the required limit, then seek reimbursement from the insured.
The MCS-90 protects the public, not the policyholder, and the insurer's right to recover from the insured is the defining feature.
Required Minimum Limits
Federal financial-responsibility minimums for interstate trucking depend on cargo: commonly 750,000 dollars for general freight, 1,000,000 dollars for certain oil and hazardous substances, and 5,000,000 dollars for the most dangerous materials such as explosives and large-quantity hazardous loads. These limits are public-protection floors enforced through the MCS-90, and a carrier hauling hazardous materials must carry the higher applicable limit. The exam tests both the purpose of the MCS-90 (public protection with insurer reimbursement rights) and the tiered minimum limits keyed to the cargo's hazard.