Technically, any machine that can move on it's own without the assistance or with partial assistance of a human is considered a robot. There are "remote controlled" robot toys out there, and some that move by themselves. Technically speaking, any automobile with auto cruise control (real cars had this dating back to the 80s, maybe earlier) could be considered a robot. Today's cars, with a computer to run the engine and auto cruise to keep the speed so you don't have to have your foot on the gas all the time, are technically robots. I have one of these cars.

You probably been in a few yourself.
However, cars are NEVER called "Robots" but seem to be considered generally a class by themselves - automotbile. Even though they technically exhibit traits attributed to robotics, they still are called cars.
So KITT and KARR were really two-part systems. Both cars. KARR had "Roving Robot" in his name because he was like a land rover (another type of robot, which in real life there are some that are used in space exploration missions to the moon, and those recently used on Mars). So yes, KITT also could be and has been called a Robot. In the Wired Top 50 best Robots, KITT did get a good high ranking, in fact.
But KITT and KARR are comprised of multiple processors and components, joined together to make a whole working system. Some components can be used when not attached to each other, some can't.
In summery, I guess I'd call KITT and KARR (and ANY automobile that has a computer and/or can work one or more parts without a driver, like the gas pedal), a robot.
We have robots all over the place, if you think about it. I think these days, we have taken them for granted to the point where we are starting to call some robots something else, and leaving the term "Robot" to mean something more advanced. Thus the term "robot" can change through the years. What was a "robot" in the 80s may only be called a "device" or "computer" or something else here in the 21st century.
