12.5 Commercial Auto Endorsements

Why Endorsements Matter

The Business Auto Coverage Form is deliberately modular, and endorsements close the gaps that symbols alone cannot. The most-tested endorsements address three problems: (1) an individual who drives company cars but owns none personally, (2) rented and employee-owned vehicles, and (3) pollution and convenience coverages.

Drive Other Car (DOC) — CA 99 10

A corporate officer who drives only the company car has no personal auto policy, so when they borrow a friend's car or rent on vacation, they have no personal coverage. The Drive Other Car endorsement (CA 99 10) extends the BAP's liability, medical payments, and UM/UIM to named individuals (and resident family members) while using autos the named insured does not own. It effectively gives the executive personal-auto-like protection through the business policy.

Trap: DOC covers NAMED individuals only — it must list the people by name. It does not blanket all employees.

Hired and Non-Owned Auto Coverage

Hired-auto physical damage is commonly endorsed with a limit equal to the most expensive unit the business is likely to rent, often subject to a deductible and a cost-of-hire rating basis.

Rental Reimbursement and Towing

• Rental Reimbursement (Transportation Expenses): pays a stated amount per day with a maximum (for example, $50/day up to $1,500) for a substitute vehicle after a covered physical-damage loss.
• Towing and Labor: pays towing and on-site labor at the place of disablement, typically for private-passenger-type vehicles only, up to a small per-disablement limit.

Pollution Liability — CA 99 48

The BAP heavily excludes pollution. The Pollution Liability — Broadened Coverage for Covered Autos (CA 99 48) restores coverage for BI/PD caused by pollutants that are NOT being transported as cargo — for example, fuel, lubricants, or fluids that are part of the covered auto and escape after an accident. Pollution from a load being hauled (a tanker spill) generally remains excluded under the auto form and is addressed through specialized motor-carrier pollution coverage and the MCS-90's hazmat financial-responsibility role.

Other Useful Endorsements

Experience Rating the Commercial Auto Premium

Larger commercial-auto accounts are experience rated: the carrier compares the insured's actual losses to the expected losses for similar risks to produce an experience modification factor (mod).

• A mod below 1.00 (e.g., 0.85) is a credit — the insured's losses were better than expected, lowering premium.
• A mod above 1.00 (e.g., 1.20) is a debit — worse-than-expected losses, raising premium.

Worked example: A fleet's manual premium is $40,000 and its experience mod is 0.90. The modified premium is $40,000 × 0.90 = $36,000, a $4,000 credit for favorable loss history. If the mod were 1.15, the premium would be $40,000 × 1.15 = $46,000, a $6,000 debit. Experience rating gives fleets a direct financial incentive to control losses.

How the Experience Mod Is Built

The modification factor compares the insured's actual incurred losses during a multi-year experience period to the expected losses for a risk of its size and class. Frequent small losses can hurt a mod more than one large loss because rating plans weight frequency heavily — many small claims signal poor risk control. Because the mod multiplies the manual premium, a fleet that reduces accident frequency sees compounding savings: a drop from a 1.20 debit to a 0.90 credit on a $40,000 manual premium swings the bill from $48,000 to $36,000, a $12,000 annual difference.

Endorsement Selection by Exposure — Quick Reference

Coordinating Endorsements with the Symbols

Endorsements and symbols work together rather than substituting for one another. A business that selects Symbol 1 for liability already has hired and non-owned liability built in, so it does not separately need hired/non-owned liability — but it still needs the hired-auto physical damage endorsement to protect the rental unit itself, because Symbol 1 physical damage is rarely written. Conversely, a business on owned-only symbols must add BOTH Symbol 8 and Symbol 9 to reach rentals and employee cars. Reading the declarations to spot which gap an endorsement fills is the practical skill the exam tests.

Putting It Together

A contractor with company trucks (Symbol 1 liability, Symbol 7 physical damage), employees who run parts errands in personal cars, a leased crane truck, and an owner who drives only the company pickup would layer: Symbol 9 for employee-car liability, hired-auto physical damage for occasional rentals, the lessor endorsement on the crane truck, and Drive Other Car for the owner. Each closes a specific gap the base form leaves open.