SDCL § 32-25-9.2: Township road speed limit--Violation as misdemeanor.

No person may drive a vehicle on a township road in excess of fifty-five miles per hour. However, notwithstanding the provisions of § 32-25-9.1, any board of township supervisors may determine and establish speed zones upon all or any highways under its jurisdiction. The township board shall notify the county of any changes and the speed zones shall be conspicuously posted at the beginning and ending of the zones. Driving in excess of the speed limit established in this section or by the township board pursuant to this section is a Class 2 misdemeanor.