Thanks for all the responses. The rider wasn't going fast so it wasn't a dangerous situation, just inconsiderate.

I ride across the Bull's island bridge, but slowly, and if the pedestrians are milling about blocking the path I just stop and wait for them. It's a wide pedestrian bridge and there is very little foot traffic. OTOH, I always walk on the pedestrian path on the steel deck bridges that cross the Delaware. For one thing, they have little trolls manning the bridge that will feed you to the fishes.

I moved away from that area a decade ago, and I sorely miss the towpaths and bridges along the Delaware...wonderful riding. I will say that on the odd occasion where there were no pedestrians, I also rode across Bull's Island bridge. Terex has it nailed, about good judgement... but then, there'll always be someone to go against what is considered good judgement, just as there will be someone upholding that particular "law" when there's no good reason... except the fact that it is the local law. In a country like ours, with our state and local sovereignities, the laws may end up not making sense when taken literally in all instances, especially when crossing the state border as in this case; but then, any one of us would have said that common courtesy (if not the law) would have been for the rider to dismount in the presence of walkers on a narrow bridge.
Reminds me of the time I stepped off of the curb to cross the street in Basel - no traffic in sight - and two separate folks reminded me not to cross in the middle of the street... we'll never have that kind of civic "dudley doright" mentality in a country such as ours. Here, practically everything ends up being a point of contention!

Again, what about bicycle paths well marked for bicycles, with pedestrians walking two and 3 abreast, taking up the right of way? It's not just the cyclists that misbehave.

I've been a pedestrian in a downtown section, trying to walk across the street at a corner intersection on a green light, with a green "Walk" light, in a painted pedestrian crossing - and cars stopped square across the crosswalk on their red light. Yeah, it's only bicyclists. Sure.

I ride frequently where it says "walk your bike" BUT, if it means I'm going to inconvenience a pedestrian, or put me at risk, I'll walk.