Abstract: A system for automatically opening and closing horizontal covers over standard inspection pit. The system comprises two grates mounted on wheels, the wheels engaging two parallel tracks attached to opposite sides of the pit. An electric motor powers the grates upon command to either move away from each other to an open position to expose the pit, or to move toward each other to a closed position to cover the pit. The system is equipped with both audible and visual warning devices which automatically activate upon movement of the grates. Also, the leading edges of the grates have sensors which cause the grates to stop and retract upon detection of a foreign object caught therebetween.