South Dakota Administrative Rules
Title 70 - Department of Transportation
Article 70:01 - Administration - Highway Safety Signs and Notices
Chapter 70:01:02 - Speed limits
Section 70:01:02:10 - Aurora County

(1) State Trunk Highway 258 beginning where the Interstate Highway 90 eastbound exit ramp intersects State Trunk Highway 258, then north for 0.35 mile, 40 miles per hour; then north for 0.17 mile to Davenport Street in Plankinton and then east for 0.44 mile, 30 miles per hour; then east for 0.20 mile, 45 miles per hour;

(2) U.S. Highway 281 beginning 0.45 mile south of the intersection of Main Street and U.S. Highway 281 in Stickney, then north for 0.35 mile, 45 miles per hour; then north for 0.35 mile, 35 miles per hour; then north for 0.2 mile, 45 miles per hour;

(3) State Trunk Highway 215 beginning at its junction with old U.S. Highway 16 in White Lake, then south for 0.55 mile to the south ramps of Interstate Highway 90, 40 miles per hour;

(4) State Trunk Highway 42 beginning at the intersection of U.S. Highway 281, then east to the Aurora-Davison county line, 55 miles per hour;

(5) State Trunk Highway 203 beginning at the intersection with State Trunk Highway 258 east of Plankinton, then north to the entrance to the State Training School, 55 miles per hour;

(6) U.S. Highway 281 beginning 0.31 mile south of the centerline of Interstate 90, then north 0.47 mile, 50 miles per hour.