31-28-1. Marking of highways with standard design--Numbers to correspond with official maps.
The Department of Transportation shall keep the various lines of highways comprising the state trunk highway system, including the connecting streets in municipalities, distinctly marked with some standard design placed on convenient objects along the routes. The design shall be uniform on all parts of the trunk highway system. However, the numbers shall correspond with the numbers given the various routes by the department. The numbers shall coincide with the numbers placed on the official map or maps issued by the department. No similar design may be used for marking other routes in South Dakota.
Source: SL 1919, ch 333, §52; SDC 1939, §28.0904; SL 2010, ch 145, §135.