As I rode my bike from East Rockhill into Perkasie, I noticed this:
Notice it says "Bikes Only" (or "Only Bikes." Depends on your point of view, I suppose).
Now, if you have enough police officers and time to enforce this, I'd say you have your crime rate well in hand. Philadelphia only wishes they had this problem.
Incidentally, as I rode down this path towards Sellersville (where it ends, as far as I could tell), I noticed one kid on a skateboard, one dude pushing a stroller, two teenagers strolling along with bookbags (school hasn't started yet; I guess they're practicing), and one old guy walking his dog. All without bicycles. Just so you know, I've alerted the authorities.
You know who you are.