Jim
Ridiculous to think Jim would actually get a license to drive.
Would you ride with him?
Nothing is impossible on a sitcom.
Having said that, there was an episode where Jim devoted himself to giving his customers the very best service possible. Turns out, he was exceptional as a cabbie (at least in that episode).
So yeah, I'd ride with him.
Look at it this way -- you'd probably get a free ride because he'd forget to collect the fare.