Section 31-5-303 - Establishing maximum speed limits by local authorities(a) Repealed By Laws 2002, Ch. 68, § 2.(b) In compliance with rules promulgated by the department, local authorities in their respective jurisdictions may determine the proper maximum speed for all streets and highways within their respective corporate jurisdiction which maximum speed is reasonable and safe and which may be greater or less than the maximum speed permitted under this act. The rules promulgated by the department shall adopt standards consistent with national practices.(c) Any altered limit established under this section shall be effective during hours of darkness or at other times as may be determined when appropriate signs giving notice thereof are erected upon the street or highway.(d) Any alteration of maximum limits on state highways or extensions thereof in a municipality by local authorities is not effective until the alteration has been approved by the superintendent.(e) Not more than six (6) alterations authorized under this section shall be made per mile along a street or highway, except in the case of reduced limits at intersections, and the difference between adjacent limits shall not be more than fifteen (15) miles per hour.Amended by Laws 2011 , ch. 32, § 1, eff. 7/1/2011.