Does having motorcycle insurance affect your auto insurance?

Motorcycle policies and auto policies are mutually exclusive meaning there is no coverage on an auto policy for motorcycles and vice versa. They are separate policies and each contains exclusions for the other type of vehicle. Accidents on either a motorcycle or car/truck will impact rates on both policies equally. In other words if you have an at-fault accident in your car it will affect the premium on your motorcycle policy. If you are asking in terms of discounts, there may be discounts if you have both policies with the same company. Shop around...