psimonyi
I went and checked. At the intersection with Sandford Fleming there are several do-not-enter signs, "authorized vehicles and bicycles excepted", plus one of the usual big red "Buses only / Autobus seulement / TRANSITWAY" arches. There's no sidewalk but nothing explicitly prohibits pedestrians. At the intersection with Riverside, there are no access restrictions.
So the counterclockwise direction is indeed buses and bicycles (and any other "authorized" vehicles) only, and the clockwise direction is open for general use.

Someone tagged horse=no on the bridge??? There are no signs either way about horses.

Also, the whole segment from Sandford Fleming to the Transitway intersection is a single carriageway with no median.  (There is a median from shortly after the Transitway to the Riverside intersection.) I imagine whoever mapped it drew two ways just to encode the access restrictions.

I'm not sure how best to map that so please do what you can!