The car is going to go down between the layers along the curve if you want to be able to interfere with the circulation building or supporting pillars had to be addressed. So the problem is solved by a thick pole to thigh.
To make the car go down along the curve up through the floor, I had to solve the pillars supporting the building to interfere with circulation. So the problem is solved by making the pole thick thighs.
the arc layer with the up and down can be transferred to or interfere with the building support to solve the problem. so the problem of the thick and wide. to work with.