A single loop is twisted into a double figure 8 to form an infinite race track. This loop has "inner" and "outer" tracks that parallel one another around the circuit. The inner track on one half of the circuit becomes the outer track on the other half and vice versa. Notably, there is a single place in the circuit where the figure 8s cross, and it is the only place where one might reach the secondary track from the primary. Continuing down this secondary track, the player can reach a room hidden from outside view, seen in the South end of Plan 02 below.
Modeled in Rhinoceros 3D and rendered with VRAY.