fredair says:
And ome question: How big do the jumps have to be? 1 block space? Or 0 blocks but diagonal (so if you imagine an X from the bottom left of the / to the top right)?
... says:updated: The route has to switch between the two quarters at least 3 times. In most cases it means that the car has to jump over the "forbidden" area. Only in the very middle the car could make it without jumping, if it drives over the edge of two platform blocks.