12.3 Motor Carrier / Trucking and MCS-90

Trucking and Motor Carrier Forms

Businesses that haul property or passengers for hire need specialized forms because the Business Auto Form does not adequately address the for-hire trucking exposure. ISO offers two: the older Truckers Coverage Form (CA 00 12) and the broader Motor Carrier Coverage Form (CA 00 20). The Motor Carrier form has largely replaced the Truckers form because it applies to any motor carrier — private or for-hire — and better handles the modern realities of leasing tractors and trailers between operators.

Trailer Interchange and Leasing

The defining problem in trucking is that operators constantly swap trailers under trailer-interchange agreements and lease tractors to/from owner-operators. Both the Truckers and Motor Carrier forms address this with:

• Trailer Interchange Coverage — physical damage to non-owned trailers in the insured's possession under a written interchange agreement.
• Provisions clarifying who is the insured when a tractor pulling a leased trailer is involved in a loss.

Under federal leasing rules (the so-called Graves Amendment landscape and FMCSA leasing regulations), the motor carrier whose operating authority is being used is generally responsible for the vehicle while under dispatch — a concept the Motor Carrier form is built around.

The MCS-90 Endorsement

The MCS-90 (Motor Carrier Act Endorsement of Insurance for Public Liability) is required by the FMCSA for interstate for-hire motor carriers of property. It is not coverage in the ordinary sense — it is a surety-like financial-responsibility guarantee to the public. The MCS-90 obligates the insurer to pay a judgment for public bodily injury or property damage even if the policy itself would not cover the loss (e.g., the vehicle was not scheduled, or an exclusion applied).

Critically, the insurer that pays under the MCS-90 has the right to reimbursement from the insured for any amount it would not otherwise have owed under the policy. The MCS-90 protects the public, not the insured.

MCS-90 Minimum Financial Responsibility Limits

The federal minimum limits depend on what is hauled:

The most commonly tested figure is the $750,000 baseline for general freight and $5,000,000 for the most dangerous hazmat.

The Motor Carrier Coverage Form

ISO writes for-hire trucking on the Motor Carrier Coverage Form (CA 00 20), which addresses exposures the Business Auto Form does not, such as trailer interchange (liability for trailers swapped between carriers under an interchange agreement) and complex owner-operator arrangements. The form uses its own covered-auto symbols geared to trucking operations.

The MCS-90 Endorsement

The MCS-90 (Motor Carrier Act endorsement) is a federally mandated financial-responsibility endorsement for interstate carriers of property. Its key features are heavily tested:

• It guarantees payment of judgments for public bodily injury and property damage up to federally required minimums (e.g., $750,000 for general freight, higher for hazardous materials), even for loads or vehicles the policy would otherwise exclude.
• It functions as a surety-like safety net for the public — the insurer must pay the injured public, then seek reimbursement from the insured for any payment the policy did not actually cover.
• It does not cover the carrier's own cargo or property damage to the insured's vehicle; it protects the public.

Cargo and Bobtail/Deadhead Coverage

Worked MCS-90 Scenario

A trucker carrying hazardous materials causes a public injury while operating a vehicle the policy technically excluded. The MCS-90 forces the insurer to pay the injured public up to the federal minimum, after which the insurer pursues reimbursement from the trucker. The exam highlights that the MCS-90 protects the public, not the insured, and creates an insurer right of recovery against the carrier — the defining feature that separates it from ordinary coverage.

Common Carrier vs. Contract Carrier

The exam distinguishes carrier types because filing and liability rules differ. A common carrier holds itself out to serve the general public and bears a higher duty of care for the cargo it carries; a contract carrier hauls under specific agreements with particular shippers; a private carrier transports its own goods.

Common and contract for-hire carriers crossing state lines need the MCS-90 and federal operating authority, while a private carrier of its own goods does not file the MCS-90 for hire but still must meet financial-responsibility minimums. Matching the carrier classification to the required filing is a recurring trucking exam point.

Bobtail vs. Non-Trucking Liability

Owner-operators leased to a motor carrier need coverage for the gaps between dispatches. Non-trucking (bobtail) liability covers the tractor when it is operated without a trailer and not in the business of the carrier — for example, driving home after dropping a load. While under dispatch, the carrier's primary auto policy responds; off-dispatch personal use is where bobtail coverage fills the gap. The exam tests this dispatch/off-dispatch line because owner-operators are uninsured for personal trips unless they carry non-trucking liability.