12.3 Motor Carrier / Trucking and MCS-90

Motor Carrier vs. Truckers Coverage Forms

Businesses that transport goods or passengers for hire need specialized auto coverage. ISO offers two forms:

• Truckers Coverage Form (CA 00 12) — the older form, still used in some programs.
• Motor Carrier Coverage Form (CA 00 20) — the modern, broader form that has largely replaced it. A motor carrier is any business that transports property by auto in commerce, whether primary (operates under its own authority) or for-hire.

Both forms use the same covered-auto symbol system as the BAP but add trucking-specific provisions: Trailer Interchange, treatment of owner-operators, and coverage while a truck operates under another carrier's authority.

Trucking Coverage Gaps to Know

Trailer Interchange

When carriers swap trailers under interchange agreements, Trailer Interchange coverage is physical damage protection for a trailer in the insured's possession that the insured does not own but is legally responsible for. It is written on a direct-primary basis up to a scheduled limit.

Bobtail and Deadhead

• Bobtail — a tractor running with no trailer attached, typically after a delivery.
• Deadhead — a tractor pulling an empty trailer, not under dispatch.

Under a lease, the motor carrier's policy may cover the truck only while operating in its business. An owner-operator therefore often buys non-trucking liability (bobtail) insurance for personal/non-business use to fill the gap when the truck is not under dispatch.

Worked rating note

Motor carrier premiums are typically rated per power unit and adjusted by an experience modification factor (mod). A fleet with a base premium of $400,000 and an experience mod of 1.25 pays $400,000 × 1.25 = $500,000; a safer fleet with a 0.80 mod would pay $320,000.

The MCS-90 Endorsement

The MCS-90 (Motor Carrier Act endorsement) is required by the FMCSA for interstate for-hire carriers. It is not insurance coverage — it is a surety/financial-responsibility guarantee to the public.

Key rules:

• It guarantees the insurer will pay any final judgment for public bodily injury or property damage from negligent operation, even if the policy itself would exclude the loss (e.g., a non-scheduled auto or an excluded use).
• Federal minimum financial responsibility is generally $750,000. For carriers hauling hazardous materials it rises to $1,000,000 (certain HazMat) or $5,000,000 (oil/hazardous substances in bulk).
• Because the MCS-90 protects the public — not the insured — if the insurer pays a claim the policy did not actually cover, the insured must reimburse the insurer for that payment plus defense costs.

Think of the MCS-90 as a public-safety backstop bolted onto the policy: the injured member of the public always gets paid up to the federal limit; the financial responsibility then shifts back to the insured if no real coverage existed.

The MCS-90: Surety in Disguise

The MCS-90 is a federally mandated endorsement attached to the policy of a motor carrier of property operating in interstate commerce. It is required by the Motor Carrier Act of 1980 and enforced by the FMCSA. The MCS-90 is not ordinary insurance — it functions like a surety guarantee to the public.

Minimum financial-responsibility limits depend on cargo:

The endorsement guarantees the carrier will pay judgments for public bodily injury and property damage up to these limits even if the loss would otherwise be excluded by the policy.

How the MCS-90 Pays — and Recovers

The MCS-90's purpose is to protect the injured public, not the insured. If a covered policy exclusion (for example, the auto was not a scheduled vehicle, or pollution applied) would normally deny a claim, the insurer must still pay the injured third party up to the federal minimum because the MCS-90 overrides the exclusion for the public's benefit.

Critically, the insurer then has a right of reimbursement against the insured for any amount it paid that it would not otherwise have owed under the policy terms. So the MCS-90 does not expand the insured's true coverage — it guarantees public recovery and shifts the ultimate cost back to the trucker. Trap: candidates assume the MCS-90 is extra coverage for the insured; it is a public guarantee with insurer recovery rights.

Common Trucking Coverage Gaps

Trucking insurance has notorious gaps the exam targets. Non-trucking liability (bobtail) covers an owner-operator's tractor when used without a trailer and not in the business of the motor carrier (e.g., driving home); the carrier's primary policy excludes this. Trailer interchange covers a trucker's liability for damage to a non-owned trailer in its possession under an interchange agreement. Motor truck cargo insures the freight the carrier is hauling against loss — a separate inland-marine-style coverage, not part of liability.

Worked example: an owner-operator finishes a haul, drops the trailer at the terminal, and drives the bobtail tractor home, causing an accident. The motor carrier's liability policy excludes the trip because the tractor was not in the carrier's business, so non-trucking (bobtail) liability must respond, or the driver is personally exposed. Trap: candidates assume the carrier's policy covers the tractor everywhere — it stops when the unit leaves the carrier's business use.