Well, as Toronto1 pointed out, they haven't forgotten about disabled people!
One of the four entrances will have a wheelchair lift, so presumably wheelchair-bound citizens lucky enough to find themselves on the same corner as the lift can take the lift up to the bridge platform and ride around over the intersection for a while. Weee!
When they've had enough fun up there, they can go back down the same way they came. If they want to actually cross the street, they'll have to dodge vechicles at street level while their able-bodied counterparts cross in total safety above, or travel to the next intersection with a street-level crosswalk.