Why does it need to be New York? All I know is I hate it when I'm walking down a path or sidewalk and some idiot on their E-bike goes flying by around a bend, no bell, no nothing. Cyclists are annoying on pedestrian paths as they are on roads.What cyclist would be traveling at 30km/h on a ostensibly bustling sidewalk of pedestrians? I'm thinking a New York City sidewalk with hundreds of people walking in both directions; what cyclist would think it'd be reasonable to ride through the pedestrian traffic at top speeds suggesting they own the sidewalk? Outside of that extreme, you've got minimal foot traffic on a sidewalk, and a cyclist can ride at a pace befitting their pedestrian surroundings. You don't really have that same luxury on the road. Driver's can expect other cars doing similar speeds per the posted limit; what they can't so readily expect is someone on a bicycle moving at a fraction of the posted automotive speed whose only protection from serious injury is a helmet and knee pads.
A cyclist might run into a person on a sidewalk, but it results in bumps, bruises, and inconvenience. A cyclist getting hit by a car easily results in severe injury if not in death. I'm sure to mitigate the severity of potential damages, the solution is obviously remove cyclists from harm's way and have them use sidewalks when possible, and the roads at their own risk.