Looks like a test track, skid pad, maybe a future addition to the game ? Where is this picture found ? I recognize the corner from Myabi, but how do you find airiel photos in GTS ?
I think the most interesting part of the mass of pavement are the multi-coloured circles on it. That indicates to me PD used it as a skid pad or something to test the physics during development. Would be cool if they made a kart track there or something.