While driving Charlotte, Frasier struggles to put on a "hands free" telephone, but in "How To Bury A Millionaire" (Season 6), both he and Martin speak to Niles on Frasier's car phone which is completely hands free, its controls on the console. It's conceivable that he has a different car, but not likely one with less features.
Frasier's "driving" when taking Charlotte to the station makes no sense if you look at the background compared to his wheel motion.
S 11 : Ep 25
Aired 5/13/04
S 11 : Ep 24
Aired 5/13/04
S 11 : Ep 22
Aired 5/4/04
S 11 : Ep 21
Aired 4/27/04
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