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South Dakota Roads and Highways - Roads & Highways Services Directory

• The South Dakota Department of Transportation
  
  The seeks to balance diverse mobility needs while retaining concern for safety and the environment. Oversees highways, aeronautics, railroads, and other transportation. ...
  http://www.sddot.com/

• The South Dakota Highways
  
  Two multistate Interstate Highways pass through South Dakota. I90 is the westeast interstate, and runs across the southern part of the state. I29 runs northsouth across the eastern portion of the state. Each has its own spur going around or through a ...
  http://www.northernplainshighways.org/sdakota/