Man, that sounds like my commute! 3 lane on either side, and no shoulder, just a concrete divider between the 'pedestrian walkway'. Even worse, it raises up so that once you chug up it, there's little vision behind you if you need to change lanes. On my commute, I have to make a left after this bridge, so that means I need to change 3 lanes (4, including turning lanes) to get suitably in the left lane to turn, while people are going 35-45 mph up over this hill. If they go too fast (and this is often wall to wall traffic) there's no way in heck they'd see me or be able to brake in time.
I solved this by riding on the pedwalk (and even that is scary, barely wide enough for one bike with cement barrier on one side and 2 story drop to the Schuylkill on the other) and then cutting through the sidewalk and parking lot of the Frosty Falls ice cream parlour. I ride the sidewalk until a point where traffic slows a bit or there is a crosswalk, and then move across the lanes.
I should take a picture of it some time. It is one of the only times I have ridden on the sidewalk on my road bike, since learning better.
It was truly a hair-raising section of the commute until I figured out the sidewalk thing!
K.