>People have asked me this, and it's funny, since "commuting" would
>include driving to work. But people think it only means taking public
>transportation. Have you noticed this usage also?
This usage of "commute" did in fact originate in public
transportation.
Webster Dictionary, 1913
http://machaut.uchicago.edu/cgi-bin/WEBSTER.sh?WORD=commute
...
2. To pay, or arrange to pay, in gross instead of part by part;
as, to commute for a year's travel over a route.
Since then the meaning of the word has been extended to include any
regular travel from home to work and back.

Signature
Peter Duncanson, UK
(in alt.english.usage)
John Dean - 28 Feb 2007 00:09 GMT
>> People have asked me this, and it's funny, since "commuting" would
>> include driving to work. But people think it only means taking
[quoted text clipped - 12 lines]
> Since then the meaning of the word has been extended to include any
> regular travel from home to work and back.
OED takes it back to early C19:
1889 Cent. Dict., Commuter, one who commutes. 1906 Daily Chron. 25 Feb. 4
There are many business men who practically divide their time between New
York and Chicago, and 'commute' (the American term for taking season
tickets).

Signature
John Dean
Oxford