Well, since you excluded ‘at other drivers’, my answer is:
I never do, because I don’t want to distract myself, so I can pay full attention to the traffic.
But I very often shout aloud when I see other drivers do something wrong. It’s never at them personally, meaning I never leave the car to argue with them. But I do call them “assholes” or “imbeciles” for doing – or not doing – something that should be done differently than the way they are (not) doing it.
Luckily it’s a very rare case for me to get aroused about other drivers’ behavior, since most of the time I manage to control myself and utter something like “Oh, just let them be, they simply can’t act other than that, ‘cause they’re Macedonians.”
While driving my Suzuki Swift I mostly sing some nice songs of the 70’s. Or think about a way to bypass a problem, or to shorten my way to the destination. Or think about what I’m going to do when the world ends and I’m the only survivor there. How, for Heaven’s sake, am I going to be able to become aroused while driving, when there will be no one around to make some stupid things in the street? Or how an I going to bypass a problem or shorten my way to the destination, when there won’t be anyone there to cause a problem or to block my way? See, those are real problems whose solution has to be figured out, and that’s why I hope that the world never ends. Or if it ends, then please not for every one, I need at least a couple other people to make my ride interesting.