Miss. Code § 65-1-45
The State Highway Commission is hereby authorized and empowered to restrict or prohibit the use of any state highway or bridge or to reduce the allowable weight permitted on any state highway or bridge when, due to any special weather or other hazard, such highways or bridges have been weakened or when such highways have substandard surfacing or weak bridges due to any cause. Likewise, the board of supervisors of any county shall have the same regulatory powers as granted the highway department in this section. It shall be the duty of the State Highway Commission and the boards of supervisors of the counties to post sufficient warning on any highway or bridge restricted in any manner, so that such restriction may be understood by the operator of any vehicle. Any person who shall operate a vehicle on any highway, road, or bridge when such highway, road, or bridge is under restriction, in violation of such restriction, shall be guilty of a misdemeanor and shall be punished in accordance with the provisions of section 63-9-11, Mississippi Code of 1972, providing for the punishment of misdemeanors.
Miss. Code § 65-1-45