The purpose of this project was to develop and test a prototype visual aid to advise pilots that a runway is temporarily closed during visual meteorological conditions. The project was undertaken in response to a request from the Office of Airport Standards, AAS-1, submitted through the Program Engineering and Maintenance Service, APM-1. The development of a lighted visual aid for this purpose was recommended by Task Group 3-1.6 of the National Airspace Review. The work was accomplished under Technical Center Project No. T19-03N, Airport Lighting and Marking. The Technical Project Manager was Rick Marinelli, ACT-310.