Source : Webster's Revised Unabridged Dictionary (1913)

Automobilism \Au`to*mo"bil*ism\, n.
   The use of automobiles, or the practices, methods, or the
   like, of those who use them. -- {Au`to*mo"bil*ist}, n.

Source : WordNet®

automobilist
     n : someone who drives (or travels in) an automobile [syn: {motorist}]