Inside IMSA

Rules and Regulations

IMSA’s flagship series competes at 12 of North America’s leading sports car venues, including Daytona, Sebring, Watkins Glen, Road Atlanta, Long Beach and Road America. Competition takes place in three different classes: Prototype, GT Le Mans and GT Daytona, with action in each of the three groups typically going all the way to the checkered flag.

IMSA, the International Motor Sports Association, has a long history as the premier sanctioning body for sports car competition in North America. The sanctioning body was founded in 1969 by John Bishop with the assistance of NASCAR President Bill France Sr. Bishop was a 12-year employee of the Sports Car Club of America, who elected to follow his own vision for professional road racing. Bishop and his wife, Peggy, brought a family-style feel to the organization, based in Bridgeport, Conn.

In September 1996, the International Motor Sports Group – a conglomerate including Roberto Mueller and Andy Evans – purchased IMSA and changed its name to Professional SportsCar Racing for 1997.

IMSA’s WeatherTech SportsCar Championship opens with a pair of historic events – the Rolex 24 At Daytona and Mobil 1 Twelve Hours of Sebring fueled by Fresh from Florida – building on the vision of John Bishop and Bill France Sr. from 45 years ago.

Inside IMSA

Rules and Regulations

Race Starts and Qualifying Procedures

SportsCar Classes

Technical Inspection

Pit Stops

Flags