LANGLEY AIR FORCE BASE, Va. – Staff Sgt. Trayshawn Humphries, 633d Security Forces Squadron speed measurement instructor, uses Light Detection and Ranging technology to determine if a driver is abiding by posted speed limits Jan. 25. Security Forces members use radar systems to monitor vehicle speed, visually estimating within five miles of the vehicle’s actual speed. (U.S. Air Force photo/Airman 1st Class Racheal Watson)(RELEASED)