Everyone who operates a motor vehicle must obey all speed limits. Your vehicle control is affected by the speed at which you drive.
15 mph within a school zone, with a posted speed limit
30 mph in business or residential areas, unless posted otherwise
55 mph on public highways, unless posted otherwise
75 mph on rural interstate highways, unless, posted otherwise
No one should drive at a speed less than the minimum posted speed limit. If no minimum is posted, drive so that you do not interfere with regular traffic flow. You should travel on the right-hand side of the road when your driving speed is slower than other vehicles. Speed should be adjusted for adverse conditions and for the type of vehicle and to avoid accidents.