Limited commemorative enhancements

(a) Authority To further honor the service and sacrifice of participants in the United States–Mexican War and to interpret the war’s causes, course, and consequences (including the Treaty of Guadalupe Hidalgo), the Secretary may install at, on, or immediately adjacent to Arlington Memorial Bridge appropriate commemorative elements limited to interpretive signage, plaques, and landscaping. (b) Limitations Commemorative elements authorized under subsection (a)— (1) shall be consistent with division A of subtitle III of title 54, United States Code (commonly known as the National Historic Preservation Act) and the National Environmental Policy Act; (2) shall not materially alter the historic character, architectural features, or structural integrity of Arlington Memorial Bridge; and (3) shall not interfere with or encroach upon any existing commemorative work.