Access devices for semi-trailers

A coupling access device for a semi-trailer includes: a cover mechanism to cover an air hose coupling for pneumatic brakes of the semi-trailer, the cover mechanism to restrict access to the air hose coupling when in a closed position, and the cover mechanism to provide access to the air hose coupling when in an open position; a lock device to engage the cover mechanism in the closed position; and a controller to actuate the lock device to allow the cover mechanism to transition from the closed position to the open position.