You are correct....there are "classes" where "DOT" approved tires are required. But a "street car" in a track just means its approved to ride on the road. Has signal lights, bumpers, glass, seat belts, headlights, muffler, insurance, it could have a stripped interior, wipers, etc, etc... but lets not beat the subject (doughpoke Juan's P5 is 100% streetable! It even has a catalytic converter!!!! (at least on the original package), hehehe.(2thumbs)
PS-the Pump gas wars by Hot Rod magazine classifies a Street Legal car, as a car that would pass a State safety inspection, have insurance and run a 25-mile cruise.