Lots of horse-drawn carriages, and more automobiles than I would have guessed.
You can tell that cars and electric trolleys are winning in 1911 by the near-absence of mounds of horse poop on the streets. 15 years before this film was shot, 2.5 million pounds of horse manure (and 60k gallons of horse urine) were left on the streets of NYC every day, and it was very evident:

On a less smelly note, one of the neat things about this film is seeing many buildings I recognise from my time there.