You can personally be liable for any property damage or personal injuries (e.g. medical bills; or pain and suffering if the injuries result in significant life impairment) you are at fault in causing if the amount of damage or injuries exceeds your insurance. Your insurance does not limit what the injured person or other driver can sue for; it limits how much your insurer will pay for you. So if you cause more damage or injuries than you have insurance, you can be held personally liable for the excess (again, assuming you were at fault--e.g. driving negligently or carelessly, in causing the accident; liability depens on fault).