A study of sub level train station transit loop.
This roundabout is part of a transit area where traffic transfers to and from tunnels connecting to Hyperloop pads on the lower level. This system would act as a conveyor belt to multiple junctions. There would be solar on all roof surfaces and wind turbines everywhere, like the center of this roundabout.
Realistically, there has to be plans to increase service loads from two-lane to four or eight lanes Hyperloop tunnels.
See tunnel close up. https://roomstyler.com/rooms/26496618/tunnel-junction