Horses caused many, many more pedestrian deaths in pre-automobile New York City than cars do today (or 30 years ago when pedestrian deaths were at their peak).

Horses caused many, many more pedestrian deaths in pre-automobile New York City than cars do today (or 30 years ago when pedestrian deaths were at their peak). And that's just them going out of control and crushing someone, never mind the infectious disease spread by mountains of manure lining and rotting horse corpses (15,000 in 1880 alone!) littering the streets.