This means that if you are in an accident which gives rise to a claim under these coverages, you are allowed to multiply the coverage by the number of cars stacked in the policy. For example, you have three cars, all insured under the same policy. You have chosen stacked coverage. The limit for the coverage is $100,000. Therefore, if you are in an accident involving the UM or UIM portions of your auto coverage, you can collect up to $300,000.00 on the policy(ies) in question. If you did not stack coverage, you would be limited to the single $100,000.00 coverage.
I will evaluate your PA auto insurance policy for free. Call me at 215-752-3732 or email me at jjsesq@comcast.net