This is a guess but most cities have a road/right of way department that does snow removal. For whatever reason, in NYC this is apparently done by the sanitatio

This is a guess but most cities have a road/right of way department that does snow removal. For whatever reason, in NYC this is apparently done by the sanitation department. I think this is a meatspace Conway's Law, unrelated to whether or not it is actually better to have separate trucks or not.