Little of the land around us (where I live, anyhow) is public property, so I get insensed when it gets infringed upon. Even more than bicycle accessability, pedestrian accessability is crucial for a functional civil society.
Therefore, I recommend that any and all pedestrians who encounter unsafe conditions make fevent conplaints to relevent State or municipal agencies. If you live in Montgomery County, MD, here's the information you need to do so:
Power to the People, Particularly the Peds.