The word ''CAR'' means car, quite simply. In computer programming, "CAR" is a Lisp operator, which stood for "Contents of the Address part of Register". That dates back to the 1950s, but is still in...
The Tranny enables the car to stand still because it controls the movement of the engine. In the USA most cars are automatic so when you put your car on "P" it locks the tranny, if your engine is on...