Trim overgrown vegetation that's taking over sidewalks

I live in Vancouver and walk frequently on West Mill Plain and also Grand Boulevard. I enjoy this part of town, and the hills, but I notice lots of overgrown Tree of Heaven and English Ivy crowding into the sidewalk, forcing pedestrians to walk on the outside edge. It's a safety hazard. I can't imagine trying to use a wheelchair on those areas.

But this should be a cheap fix : )