President Grant was pulled over for speeding when he was the sitting president, and Paul Revere was stopped by authorities during his famous ride. That makes me wonder, what were speed limit laws and traffic stops like in the horse-and-buggy era? I have not been able to find general histories of the topic and I find it interesting, since people tend to think of speeding and getting pulled over as modern inventions.
While I was writing a paper about seamen criminality in Gothenburg (Sweden) 1850-1900 i discovered that one of the more common crimes recorded by the patrolling policemen was driving your wagon carelessly (and not too uncommon they had hit a person, it those cases often children).
There were no mentions of a speeding ticket or the like, just driving carelessly. Another quite common crime was leaving your horse and cart unattended (19th century parking ticket).
I dont know about the US or anything else than Gothenburg at the time tho...
One thing to note is that no radar gun was necessary to know if a horse was trotting or galloping, rather than walking. Most city ordinances about speed were phrased to proscribe those behaviors, as well as the more judgmental "recklessness."