A K.I.T.T. replica was at Universal Studios from 1984 to 1996. A Universal employee, somewhere off screen, would act as the car’s voice, greeting visitors, cattily responding to questions, and so on.
You may remember the Diff’rent Strokes two-parter “Hooray for Hollywood” (1984), where Arnold and Dudley sneak out of the Universal tour to track down David Hasselhoff, who’s shooting a Knight Rider episode at the studio. They get stuck in a car set for demolition, and The Hoff and K.I.T.T. have to save them.
(Images via therpf.com, efholtmann1/Flickr, Nathan King/Flickr)
2 Warps to Neptune 
2W2N, nobody remembers the Diff’rent Strokes two-parter you are referring to. In fact, I’m fairly sure we attempted to forget it immediately after watching it.
Those late episodes are bad. That’s why they’re so good.