Wireless road condition signs installed
Members of the 28th Security Forces Squadron Logistics and Resources Section assemble the first of six new road condition signs on Ellsworth Air Force Base, S.D., Aug. 31, 2011. The signs are controlled wirelessly, and display the current road conditions and speed limit, which allow drivers to adjust their speed and driving practices to help make the road a safer place. (U.S. Air Force photo/Airman 1st Class Kate Thornton/Released)