12.3 Motor Carrier / Trucking and MCS-90
Key Takeaways
- The Motor Carrier Coverage Form (ISO CA 00 20) replaced the older Truckers Coverage Form for most motor carriers and uses its own covered-auto symbols (61 through 71) and a trailer interchange concept.
- The MCS-90 endorsement is a federally mandated financial-responsibility surety, not insurance; it forces the insurer to pay an injured public claimant even when the policy itself would exclude the loss, then lets the insurer seek reimbursement from the insured.
- Federal minimum financial-responsibility limits under the FMCSA are commonly $750,000 for general freight, $1,000,000 for oil and certain hazardous materials, and $5,000,000 for the most dangerous hazmat.
- Trailer interchange coverage insures the insured's legal liability for physical damage to non-owned trailers in the insured's possession under a written interchange agreement.
- A primary purpose of trucking forms is sorting liability among owner-operators, motor carriers, and the public during periods when the truck is or is not under dispatch.
Motor Carrier Coverage Form (CA 00 20)
Trucking firms that haul property for others face exposures the standard Business Auto form was not designed for: hauling under dispatch, owner-operators who lease their tractors to a carrier, and physical damage to non-owned trailers swapped between carriers. ISO addresses these with the Motor Carrier Coverage Form (CA 00 20), which replaced most uses of the older Truckers Coverage Form (CA 00 12).
A motor carrier is a person or organization providing transportation by auto in the for-hire business. The form has its own symbols, numbered 61 through 71, paralleling the Business Auto symbols (for example, 61 = Any Auto).
Trailer interchange
When carriers exchange trailers under a written trailer interchange agreement, a carrier may be holding another company's trailer. Trailer Interchange Coverage insures the insured's legal liability for physical damage to a trailer in its possession but not owned by it, while subject to the interchange agreement.
This is legal-liability coverage, not direct physical-damage coverage on an owned trailer, so the trigger is the insured's responsibility for the damage under the agreement. Comprehensive, Specified Causes of Loss, and Collision deductibles apply as scheduled.
The MCS-90 endorsement
The MCS-90 endorsement (Endorsement for Motor Carrier Policies of Insurance for Public Liability) is required under the Motor Carrier Act of 1980 and administered by the Federal Motor Carrier Safety Administration (FMCSA).
Key concept: the MCS-90 is a surety/financial-responsibility guarantee to the public, not coverage for the insured. It obligates the insurer to pay a judgment an injured member of the public obtains for BI or PD even if the underlying policy would not cover the loss (for example, the truck was not a scheduled auto, or the cargo or pollution exclusion would otherwise apply).
Reimbursement: because it protects the public, the MCS-90 lets the insurer recover from the insured any amount it pays that it would not have owed under the policy terms. So the insured is not getting free coverage; the public is getting a guaranteed source of recovery.
FMCSA minimum financial-responsibility limits
The required minimum limit shown on the MCS-90 depends on what is hauled and vehicle weight:
| Cargo / operation | Minimum limit |
|---|---|
| Non-hazardous freight, vehicle under 10,001 lbs | $300,000 |
| General freight, vehicle 10,001 lbs or more | $750,000 |
| Oil, certain hazardous substances, or hazardous waste | $1,000,000 |
| Most dangerous hazardous materials (explosives, poison gas, radioactive) | $5,000,000 |
Exam trap: the MCS-90 limit is the federal minimum and operates as a floor; it does not raise the policy's own liability limit for the insured's benefit. The endorsement applies regardless of which specific vehicle was involved, which is why it can pay where covered-auto symbols would otherwise leave a gap.
A trucker hauling general freight in a 40,000-lb tractor-trailer causes a serious injury while driving a vehicle that was mistakenly left off the schedule. The injured member of the public obtains a judgment. How does the MCS-90 endorsement function?
Under a Motor Carrier Coverage Form, Trailer Interchange Coverage most directly insures which exposure?
The MCS-90 Endorsement
The MCS-90 is the most-tested trucking concept because it is not insurance - it is a federally mandated financial-responsibility surety. It forces the insurer to pay an injured member of the public the federal minimum, even when the policy itself would otherwise exclude the loss (wrong vehicle, hauling unscheduled cargo, policy lapse). After paying, the insurer is entitled to reimbursement from the insured. Its purpose is to guarantee that the public is paid, not to broaden the trucker's own coverage.
Federal minimum financial-responsibility limits set by the FMCSA are heavily tested:
| Cargo | Minimum Limit |
|---|---|
| General freight (interstate) | $750,000 |
| Oil and certain hazardous substances | $1,000,000 |
| Most dangerous hazardous materials | $5,000,000 |
Motor Carrier Form and Trailer Interchange
The Motor Carrier Coverage Form (CA 00 20) replaced the older Truckers form for most motor carriers and uses its own covered-auto symbols 61 through 71. A key concept is trailer interchange: when carriers swap trailers under written agreements, the trailer interchange coverage insures the insured's legal liability for physical damage to non-owned trailers in its possession under that agreement.
A central purpose of trucking forms is sorting liability among owner-operators, motor carriers, and the public depending on whether the truck is under dispatch for the carrier at the time of loss. When the rig is hauling under the carrier's operating authority, the carrier's coverage and the MCS-90 respond; when it is being used for the owner-operator's personal purposes (deadheading home, bobtailing), different coverage applies. This dispatch question drives many trucking exam scenarios.
A trucker, while hauling general freight interstate, causes an accident injuring a motorist, but the specific tractor was never added to the policy and would be excluded. How does the MCS-90 affect payment to the injured public?
Bobtail, Deadhead, and Non-Trucking Use
A recurring trucking exam theme is non-trucking use, often called bobtail coverage. When an owner-operator leases a tractor to a motor carrier, the carrier's policy (and the MCS-90) generally responds while the truck is under dispatch - hauling under the carrier's operating authority. But when the same tractor is driven for the operator's personal purposes (going home after dropping a load, running a personal errand), it is not under dispatch, and the carrier's coverage may not apply.
Bobtail liability (driving the tractor without a trailer) and non-trucking use endorsements fill that gap by covering the operator's liability when the rig is not in the carrier's service. The exam tests this by describing a tractor involved in a crash and asking who pays: if it was hauling under dispatch, the carrier's policy and MCS-90 respond; if it was being used personally without a trailer, the bobtail or non-trucking-use coverage is the correct answer. Sorting liability by dispatch status is the heart of trucking coverage analysis.