The historic racing car definitions listed below have been reproduced with permission from CAMS, from the 1999 CAMS manual of motor sport.

• Ja & Jb Vintage Cars (Pre-1931)
• Ka and Kb Post-Vintage Thoroughbred Cars (1931-1940)
• Lb Sports-racing & racing cars 1/1/41 up to 31/12/60
• M Racing & Sports racing 1/1/61 up to 31/12/65
• Nb Production Touring Cars (Pre-1965)
• Nc Production Touring Cars (1965-1972)
• O Racing & Sports Racing Cars (1966-1969)
• Formula 5000 Racing Cars (Pre-1978)(Group P)
• Q Racing & Sports Racing Cars (1970-1977)
• Sa Production Sports Cars (1941-1960)
• Sb Production Sports Cars (1961-1969)
• Sc Production Sports Cars (1970-1977)
• Regularity

• Groups J & K entry list
• Groups Lb sports & racing entry list
• Groups M & O racing entry list
• Groups P & Q racing entry list
• Groups M,O,Q & Sc sports entry list
• Groups Sa & Sb entry list
• Groups Nb & Nc entry list
• Regularity entry list
• Classic Motorcycles
• Post Classic Motorcycles
• Sidecars