In the US the word should be "ramp." It seems to me that if the
proper terms are best defined by the people that are most directly
related to the use, then the word in the US should be "ramp."

Considering the slope of most so-called "ramps" is nearly flat, I fail to
see how this is the correct term.

Perhaps it should be called the more logical "plane park".

It reminds me of the term The Simpsons has made popular for a garage: "car
hole".