Canuck here. The city I live in only caps ebike speeds on the pathways at 20km/hr (Personally I only see riders going this fast when there's no one else in sight. When they approach others on the pathways they slow right down. Most also slow right down when going around blind corners or bends). You can ride them on sidewalks but must have peddle assist disabled. When riding on the roads you must follow the rules of the road.

Could be an option for NYC. But limiting ONLY ebike speed on roads is not cool. Why should they be forced to go slower when big death traps can go flying past them??