(a) All traffic control devices placed pursuant to the provisions of this Traffic Code shall conform to the "Manual of Uniform Traffic Control Devices for Streets and Highways" adopted by the Ohio Department of Highways.
All traffic control signals or devices to regulate traffic control in the City shall be kept in operation twenty-four hours a day of each and every day throughout the year, except school flasher lights used to regulate traffic in school zones.
(1957 Code §19-40)