A cameraman takes one of those newfangled motion picture cameras on a streetcar driving down Market Street in San Francisco in 1905, a year before the big earthquake: Video of San Francisco in 1905
Notice how many horses and how few cars there are, yet I don’t see any horse apples lying on the road. Somebody must have been dilligent in cleaning up after the horses. One of the reasons why people went to cars was that they polluted less than horses, which dropped horse crap everywhere. In New York, they left dead horses in the street until they decomposed enough to saw them up easily and cart them away piecemeal.