Screamer 4x4 was a good (if basic) off road sim, shame it was badly programmed. I really enjoyed F355 Challenge on the Dreamcast, going back in time Car & Driver had great physics and I remember Test Drive 2 had proper gear shifting. Hard Drivin' in the arcade was great (with the key to start it), and Grand Prix 1 was ahead of the competition (though not my thing).
Indianapolis 500 was the second best game to have one track (after Hard Drivin'), Nascar 2003 was good too ... hmmm, could go on ...