This determination is made on a case-by-case basis, depending upon the nature of the insurance coverage purchased under the additional policies and the particular language of these policies. In this situation, in order to maximize the ability to tap into the insurance coverage of multiple motor vehicles in the household, it is critical to have “uninsured/underinsured motorist coverage” and “stacking” as part of all motorcycle and automobile insurance policies you purchase and maintain. The attorneys at Georgelis Injury Law Firm are always ready and willing to answer your questions about the interaction of coverage(s) between and among motorcycle and automobile insurance policies in a household.