Have you ever noticed when driving that anyone who is driving slower than you is an idiot? And anyone driving faster than you is a maniac? “Say, look at this idiot here! Will you just look at this idiot, just creeping along — whoa, look at that maniac go!” I mean, it’s a wonder we ever get anywhere at all, with all the idiots and maniacs there are.

George Carlin (1937-2008) American comedian

Show (1984-04-19), On Campus, “Cars and Driving,” University of California, Los Angeles

(Source (Video); dialog verified)

This skit was put in text in Napalm & Silly Putty, "Cars and Driving, Part 1," "Idiots and Maniacs" (2001):

Have you ever noticed when you're drivin', anyone goin' slower than you is an idiot? And anyone goin' faster than you is a maniac? "Will you look at this idiot!" [points right] "Look at him! Just creepin' along!" [swings head left] "Holy shit! Look at that maniac go!" Why, I tell ya, folks, it's a wonder we ever get anywhere at all these days, what with all the idiots and maniacs out there.

Which was in turn recorded as an audiobook by Carlin. Note the audio version of the book adds "Whoa!" in front of "Holy shit!" and omits the words "these days."