^ Berger, Allen N.; Cummins, J. David; Weiss, Mary A. (October 1997). "The Coexistence of Multiple Distribution Systems for Financial Services: The Case of Property-Liability Insurance" (PDF). Journal of Business. 70 (4): 515–46. doi:10.1086/209730. Archived from the original (PDF) on 2000-09-19. (online draft Archived 2010-06-22 at the Wayback Machine)
Auto insurance will generally cover a driver from any state as long as he has the insured’s permission to operate the vehicle. However, this isn’t always the case. In all instances, when someone else operates the insured’s vehicle, the auto coverage and policy terms may vary greatly depending on the carrier and insurance options selected by the insured. That said, if an insured is driving a company/commercial vehicle which has Med Pay/PIP coverage, that coverage is usually primary over the driver’s personal auto policy, which will be secondary in terms of coverage. There are some exceptions.
Benefit insurance – as it is stated in the study books of The Chartered Insurance Institute, the insurance company does not have the right of recovery from the party who caused the injury and is to compensate the Insured regardless of the fact that Insured had already sued the negligent party for the damages (for example, personal accident insurance)
Large loss: The size of the loss must be meaningful from the perspective of the insured. Insurance premiums need to cover both the expected cost of losses, plus the cost of issuing and administering the policy, adjusting losses, and supplying the capital needed to reasonably assure that the insurer will be able to pay claims. For small losses, these latter costs may be several times the size of the expected cost of losses. There is hardly any point in paying such costs unless the protection offered has real value to a buyer.
Comprehensive and collision auto insurance coverage, on the other hand, are tied to the insured vehicle (they follow the car). These coverages pay for damage that befalls the insured vehicle as a result of an accident or vandalism. One could say that if you loan your vehicle, you loan your insurance. With comprehensive insurance which covers almost everything, it is the car rather than the driver that is covered. This, however, requires many stipulations to be put in place, such as who is allowed to drive the car. If someone other than the insured is driving a vehicle covered by comprehensive coverage and is not listed as a covered driver – even if the other person has permission – the other person might not be covered in an accident. Family members (such as children or a spouse) are generally already included in the policy definition of “insured.” However, rarely will insurance cover a driver operating a vehicle without the owner’s permission.
In general, insurance coverage for an insured driving someone else’s vehicle is the coverage he carries for his own vehicle. The driver’s personal coverage will apply in most cases when driving a vehicle he does not own. This includes any uninsured motorist coverage he carries and the medical portions of his policy. The driver’s property damage coverage might carry over while driving another’s car as well, depending on the policy language, the respective limits of the two policies involved, and the facts. If a person drives his own vehicle without insurance, he should not expect that he is covered when driving someone else’s vehicle.
Comprehensive car insurance covers damages from an "act of God," or events that are not caused by a car driving into something else. An "act of God" can include things like damage from a heavy tree branch falling on your car. Since you have no control over when or why a tree branch would fall on your car, this kind of accident would be covered under your comprehensive policy.