• No person may operate on a public street or highway an non-licensed off-road vehicle except for crossing from one side of the road to the other. A person 12 years of age or older may operate an off-road vehicle in a highway ditch if the vehicle is operated as close as possible to the outer edge of the highway right-of-way. (SDCL 32-20-12).
   
• No person may operate an off-road vehicle, even if it's licensed, in a highway ditch along the interstate highway system or on the highway, or operate an off-road vehicle on any lands owned, leased, or controlled by the Department of Game, Fish and Parks.  (SDCL 32-20-12 and SDCL 32-20-13).
   
• No person under the age of 18 may operate or ride any motorcycle or all terrain vehicle without wearing a helmet that meets the Department of Transportation Motor Vehicle Safety Standard 218.  (SDCL 32-20-4)  
   
• No person may operate an off-road vehicle on any highway ditch designated as part of the state snowmobile trails system or bike trails, except on a designated off-road vehicle trails. (SDCL 32-20-12).
   
• To obtain a license for an all terrain vehicle, the vehicle must be a 200 cc Engine or more, have a rearview mirror, horn, exhaust and muffler, headlights, tail lights, and stopping lights. (SDCL 32-20-13).
   
• Every driver or owner of a motor vehicle (includes all terrain vehicle) shall at all times maintain financial responsibility (insurance) on the motor vehicle (all terrain vehicle).  (SDCL 32-25-113).
   
• The operator of a moped or licensed all-terrain vehicle shall have a valid motor vehicle operator's license or permit.
  (SDCL 32-20-2)
   
• No person may operate an all terrain vehicle unless he/she is wearing eye protective device or has a windscreen of sufficient height and design so as to provide adequate eye protection.  (SDCL 32-20-4.1)   
   

• Upon the immediate approach of an authorized emergency vehicle making use of audible or visual signals, the driver of vehicle shall immediately pull over to the right hand side and stop and remain in such position unless otherwise directed by a police or emergency personal until the authorized emergency vehicle has passed. (SDCL 32-31-6).

• Upon approaching from any direction any stopped authorized emergency vehicle making use of red visual signals, the driver of the vehicle shall come to a complete stop before reaching the stopped emergency vehicle, unless otherwise directed, proceed with caution only after ascertaining that it is safe to do so. (SDCL 32-31-6.1).
   
• Approaching from any direction any stopped vehicle making use of amber or yellow warning lights on an interstate highway or other highway with two or more lanes traveling in the same direction as the vehicle, merge into the lane farthest from the vehicle and proceed with caution. (SDCL 32-31-6.1).
   
• Approaching from any direction any stopped vehicle making use of amber or yellow warning lights on a two lane highway, must slow to a speed that is at least 20 miles per hour less than the posted speed limit or five miles per hour when the speed limit is posted at 20 miles per hour or less and proceed with caution, unless otherwise directed.
  (SDCL 32-31-6.1).

• Anyone that is 17 years of age and under must be wearing a seat belt during all times and anywhere in the vehicle.
   
• Children under the age 5 years and under 40 pounds are required to be in a "safety seat."
   
• The offense is a "primary offense" which means that the driver may be pulled over for the violation. The driver is responsible for all passengers that are 0-17 of age. All operators and passengers of the age of 14-17 are responsible for themselves and can be ticketed too. (SDCL 32-38-5, SDCL 32-37-1.3, and SDCL 32-37-1.2).
   
• The driver and front seat passenger, of any age, of a vehicle shall be wearing a seat belt properly during all times when the vehicle is in motion.  (SDCL 32-38-1)  

• The driver of any motor vehicle involved in an accident resulting in bodily injuries or death to any person or property damage $1,000 or more to any one person's property or $2,000 per accident shall immediately, by the quickest means of communication, give notice of the accident to the nearest available law enforcement officer who has jurisdiction.  (SDCL 32-34-7).

• No vehicle, within a no-passing zone may make a U-Turn, nor may any such turning movement be otherwise made unless it can be made in safety and without interfering with other traffic. (SDCL 32-26-25).
     
• The driver of a vehicle that is overtake another, may not go over the posted speed limit. (SDCL 32-25-1.1 or SDCL 32-5-7).

• The driver of any vehicle shall obey the instruction of any official traffic control device (traffic signs which includes road closure signs) thereto placed in accordance to state law, unless the driver is directed by a law enforcement officer to do otherwise. (SDCL 32-28-10).   
   

These are some traffic laws within the state of South Dakota.  Some wording of the law have been changed on this site to
better understand the information.  Some information may be out dated.