A. Whenever it is deemed necessary because of construction or maintenance work, or because of emergency to suspend all or part of the travel on a public highway or street or portion thereof, the appropriate highway authority of the state, county or city may restrict the use of, or close, such highway, street or portion thereof.
B. Whenever such highway, street or portion thereof is so restricted or closed to travel, the highway authority shall cause suitable barriers and notices to be posted at the point where the detour road takes off from such closed or restricted highway or street, and such detour shall be clearly indicated by signs and the same shall be adequately maintained.
C. It is unlawful for any person wilfully to fail to observe any barricade, warning light, sign or flagman warning the public that a highway or street, or portion thereof, is restricted or closed to traffic. (Prior code title 46, art. 4 § 88.1)