The City shall post and maintain appropriate signs at recognized entrances to the City and in City Hall, proclaiming Baltimore City’s status as a nuclear-free zone. When posted on City streets or on state or federally supported roads entering Baltimore City, such signs shall conform with the standards set forth in § 28-44 of the Federal Highway Administration’s Manual on Uniform Traffic Control Devices for Streets and Highways. City Code, 1976/83, art. 3, §3(c) Ord. 92-012