12.5 Commercial Auto Endorsements

Key Commercial Auto Endorsements

The basic Business Auto form is routinely modified with ISO endorsements that close gaps or extend coverage. The exam expects recognition of the most common forms by purpose:

Drive Other Car (DOC) Endorsement

The Drive Other Car (CA 99 10) endorsement solves a classic gap: a company executive drives only a company car and has no personal auto policy. The BACF covers the company car but not the executive when borrowing a friend's vehicle on a weekend. DOC extends the named individual's coverage — liability, medical payments, UM/UIM, and physical damage — to autos the company does NOT own, mimicking the protection a personal auto policy would give that person and their resident family.

Hired and Non-Owned Liability

Small businesses without owned vehicles still face exposure when employees run errands. Hired Auto and Employers Non-Ownership Liability coverages (often via symbols 8 and 9 or specific endorsements) protect the business for vehicles it rents or for employee autos used on company business. The business is the insured — the coverage is excess over the employee's own auto policy.

A classic exam scenario: an employee runs a bank deposit in her own car and causes an accident. Her personal auto policy responds first as primary. The employer's hired-and-non-owned coverage responds as excess, protecting the business from a suit naming it under vicarious liability. The endorsement does NOT make the employer's policy pay the employee's own damages or repair the employee's car — it shields the business entity from third-party claims arising out of that employee's business use.

Drive Other Car vs. Hired/Non-Owned

Candidates confuse these. Drive Other Car protects a named individual (and resident family) the way a personal auto policy would, because that person has no PAP. Hired and Non-Owned protects the business entity for autos it rents or for employee autos used on its behalf. One fills a personal gap for a key person; the other fills a corporate vicarious-liability gap.

Experience Rating and the Mod Factor

Large commercial auto accounts are experience rated: the insured's own past loss history adjusts the manual premium up or down through an experience modification factor (mod). A mod of 1.00 is average; below 1.00 is a credit (better than average), above 1.00 is a debit.

Worked example: A trucking fleet has a manual premium of $120,000 and an experience mod of 0.85.

The 0.85 mod produces an $18,000 credit because the fleet's losses ran better than the class average. A mod of 1.20 on the same premium would instead produce a $24,000 debit ($144,000 total), rewarding safe fleets and penalizing loss-prone ones.

Rating Concepts to Distinguish

• Manual (class) rating — base rates from the rate manual applied by vehicle class, size class, radius of operation, and use (service, retail, commercial).
• Experience rating — the prospective mod above, using the insured's PAST losses to adjust future premium; applies to larger eligible accounts.
• Schedule rating — credits/debits for risk characteristics not captured by class rates (driver training, fleet maintenance, safety programs), typically within a filed range such as ±25%.
• Retrospective (retro) rating — the final premium is computed AFTER the period using actual losses, subject to a minimum and maximum premium.

Exam questions test whether a candidate can separate experience rating (past losses, prospective) from retrospective rating (current-period losses, computed after the fact). Both reward good loss experience, but the timing and mechanics differ.

Common Business Auto Endorsements

The business auto and motor-carrier forms are routinely modified by endorsements that the exam expects a producer to recognize:

Drive Other Car - the Executive Gap

A company executive who has no personal auto policy (the company car is the only vehicle) has a gap when driving a borrowed or rented car for personal use, because the business auto policy covers business use of owned autos. The Drive Other Car endorsement fills this by extending liability, medical payments, UM, and physical damage to the named individual (and spouse/family) while using non-owned autos - essentially giving the executive personal-auto-style protection.

Individual Named Insured and Hired/Non-Owned

The Individual Named Insured endorsement broadens a business auto policy issued to a sole proprietor so it protects the individual and family for personal use, closing the gap that exists when a proprietorship's only auto coverage is commercial. Hired Auto Physical Damage and Employees as Insureds endorsements are frequently added so the policy responds when employees drive rentals or their own cars on company business.

Pollution and the Covered-Auto Exposure

The base business auto form excludes pollution except for fuel, lubricants, and fluids needed for the auto's operation that escape from a normally designed part. The Pollution Liability - Broadened Coverage for Covered Autos (CA 99 48) endorsement restores coverage for pollutants being transported or towed by a covered auto when released because of an upset, overturn, or collision - critical for tanker and hazardous-cargo haulers. Knowing that the unendorsed business auto policy gives almost no coverage for a cargo spill is a recurring exam point that ties back to the MCS-90 public guarantee.