safety fence lighted by dusk

alarm alert area barred barrier barring blocked blocking blue boundary brass closed construction cordoned cordoning danger darkblue deterrent dusk electrical electricity electronic evening exclusion fence fencing flood floodlight gloaming guards head hour impassable inaccessible jail keep lamp light lighted metallic night nightfall object offlimits outdoors outside prohibited protect protection protective restricted safety scene searchlight secure security sky spot spotlight structure sunset twilight wire zone