Again, here in PA, insurance carriers normally add “Uninsured Motorists” coverage to most all polices. The cost is very nominal, but in cases where the other driver does not have insurance, the injured insured party is covered.
BTW, it is also illegal to operate a motor vehicle in this state w/o insurance, but that does not stop some people from driving anyway. When a driver is stopped for any reason here in PA, they are required to show license, registration and proof of insurance. If any of those items are not shown, the driver may be fined on the spot, or the Trooper or police officer may require them to show up at their Barracks or police station in a minimum amount of time, usually 24-48 hours, with the required missing proof.
I never counted the number of times that I had made routine traffic stops and the driver could not show one, two or all three of the required documents, but it was plenty. In some cases, I even had their vehicle confiscated, until they could show their documents. Sounds harsh, but sometimes it’s necessary to do so.