The potential tort liability of owners and operators of commercial motor vehicles implicates a number of unique legal issues. These range from some that are more obvious, such as the simple increase in the kinds and extent of risks of personal injury and property damage that arise from commercial vehicle use in contrast to the operation of private vehicles, the numbers of operators and numbers and types of vehicles involved in commercial activities, and the so-called "deep pockets" of business entities that make them more susceptible to having tort actions brought against them, to less immediately apparent matters such as the existence, in some jurisdictions, of a legal presumption, which would have to be affirmatively overcome by the persuasive evidence of a commercial vehicle owner, that the operator of a commercial vehicle is in fact the employee or agent of the owner at the time the vehicle is involved in an incident giving rise to potential tort liability.
Some motorist insurance policies exclude coverage for injuries and damages if they occur while a vehicle is being used for a business purpose. For example, if a driver is using his or her personal van to make deliveries for the driver's home-based business and causes a collision with another vehicle, the driver's insurance company would refuse to pay for the damage caused to the other vehicle and for any injuries to those riding in it. In effect, the exclusion causes a vehicle to drive in and out of insurance coverage depending on its driver's particular mission.
When an insured files a lawsuit against an insurance company, the insurance company can file a counter claim against the insured to reduce the amount of the insured's claim by an amount that the insurance company claims that the insured owes to it. The amount owed can be unpaid premiums or funds received by the insured from other sources that would exceed the amount of the insured's loss. This is called a setoff, an offset provision, or a benefit-set off provision. In the case of no-fault insurance, setoffs exist for a number of benefits that an insured could obtain due to an automobile accident.
Underinsured motorist coverage, sometimes abbreviated UIM, and uninsured motorist coverage, sometimes abbreviated UM, are included in motor vehicle insurance policies as a consequence of the fact that many owners and operators of cars and trucks either do not maintain adequate insurance coverage on their vehicles or operate those vehicles without any insurance coverage at all.
When one person pays to another person an amount due to the second person by a third person, the first person has a right to recover from the third person the amount paid to the second person. This right of payment is called a subrogation. Subrogation is a doctrine of equity. It is the substitution of the first person in the place of the second person, who had a claim upon the third person. When an insurance company pays its insured for a loss under an insurance policy that was caused by a third party, the insurance company acquires the right of subrogation against the third party.