S.D. Codified Laws § 34-31A-19

The Department of Public Safety, with the advice and cooperation of the South Dakota Firemen's Association may establish a system of rural routings which shall be as uniform as is practicable throughout the state, for the purpose of aiding rural fire-fighting equipment and other emergency vehicles in locating and arriving quickly at the scene of a fire or other emergency within any area which they might logically be called upon to serve.