While plowing residential streets, the snowplows tend to travel between 10 and 20 miles per hour. On wider streets the plows travel closer to 30 miles per hour. When the snowplows are fully loaded and plowing, they are very heavy and the engines have to work hard. The noise from the truck engines may give the impression that the trucks are traveling fast while they really are not. Also, the size of the trucks can also be a bit misleading for judging vehicle speed.