OK I've attached a picture. The fat purple line is of course Google's car route.
The thin red line is where I came South. You can see I started from a bike path in the park, next to Wissahickon Creek. Turned onto Ridge Ave, rode a block, turned right onto Kelly Drive (or a lane that becomes Kelly Drive anyway). It is one-way from there all the way to where the red line meets the purple line.
The problem is, now I want to reverse the route, starting from Kelly Drive I want to get onto that path. The only way I can see (from the map) is to stay in the road, riding up and over the overpasses and following the lane that merges onto Ridge ave, then turn right onto the path. I drew that in light blue where it diverges from Google's line.
Anyone know a better way?