SIOUX FALLS, S.D. (KELO) -- Authorities blocked off the northbound lane of South Dakota Highway 73 near mile marker 53 after a vehicle slid off the road. Authorities blocked a portion of South Dakota Highway 73 near Quiver Hill Sunday after a vehicle slid off the roadway early Sunday morning. Deadly hit & run on Pine Ridge Reservation Olson Towing was contracted to help recover the vehicle. Authorities urge drivers to slow down and drive the conditions.