“Fault” is a legal concept that basically means responsibility. Someone at fault for an accident was responsible for it, and under our laws the party at fault pays compensation to victims.
Fault and no-fault states have different insurance requirements. In Florida, for example, motorists have personal injury protection benefits, called PIP. A driver involved in an accident can always tap these PIP benefits, even when they are at fault for the accident.
In a fault state, however, motorists carry liability insurance. This coverage only pays out benefits when the policyholder is at fault and injures someone else. The victim can therefore make a claim for compensation.
Truck companies carry liability policies. If the truck travels across state lines and weighs more than 10,000 pounds, then current federal law requires at least $750,000 in insurance—much more than what the ordinary motorist must carry. Companies can lose the right to carry goods in interstate commerce if they do not have the necessary insurance, so the public should be protected.