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South Dakota Road Laws

     Speed Limits: Interstate Highways: Maximum 75 mph. Speeds are posted lower around Rapid City, Sioux Falls and North Sioux City however. Other Highways: Maximum 65 mph unless otherwise posted. Speed limits on most of the scenic roads in the Black Hills are 45 mph or slower. Curves may be posted as little as 15 mph. City Streets: 25 mph unless otherwise posted.
     Seatbelts: Drivers and front seat passengers must use seatbelts. However vehicles cannot be stopped for seatbelt violations alone. A child restraint system (infant seat) is required for children under the age of 5.  A vehicle can be stopped if a child is not properly restrained.
     Headlights: Must be used between 1/2-hour after sunset and 1/2-hour before sunrise and at other times when necessary for safe driving.
     Motorcycles: Helmets are not required for adults; however all persons under the age of 18 must wear approved helmets. Eye protection or windshield is required. Rear view mirror required. Handle bars may not be no more than shoulder high.
     DWI/DUI: Operators with a blood alcohol level of 0.10 percent or higher must not operate a vehicle. Implied consent for breathalizer and/or blood tests. Legal drinking age for all alcoholic beverages is 21. (DWI, Driving While Intoxicated; DUI, Driving Under the Influence.) 
     Bicycles: Bicycles may be ridden on any roadway in South Dakota except in areas where they are specifically forbidden. Bicyclists must obey all traffic laws. (Note: Bicycles may use portions of the South Dakota Interstate Highway System.)
     ATVs: South Dakota registered and licensed ATVs may be used on most roads except the Interstate Highway system. ATVs must be at least 250cc or larger and have a horn and mirror to be road legal.  ATVs road licensed in other states may be used on South Dakota roads. Helmets are not required for ATV use except for persons under the age of 18, however eye protection or a windshield is required for on-road usage.