A specific type of race car, typically american muscle cars. This class of vehicles are highly tuned, intended for pro-class races, but still have the ability to be street-legal (that they have proper safety features, lights and signals, and depending on jurisdictions, keep within a specified weight-to-horsepower ratio.) Commonly seen pro/street cars are Chevy Novas, Chevelles, Plymouth Cudas, Dodge Chargers and Challengers.
Billy Bob just took his pro/street Plymouth Duster to the tack. He got a 10-second ET on the 1320