The outbound lanes at the Main gate on Joint Base Andrews, Md., will be closed June 15 through July 1, 2015, due to construction. The outbound lanes at Westover Gate, also known as Old Main Gate, located at the intersection of North Perimeter Road and Westover Drive will be opened daily from 3:00 p.m. - 6:00 p.m. for individuals departing the installation.