(a) The maximum speed within the town shall be 30 miles per hour. With respect to residential districts, the town may set a maximum speed limit of 25 miles per hour after investigation determines that such a limit is reasonable. However, the town may set speed zones altering such speed, both as to maximum, not to exceed 55 miles per hour, and minimum, after an investigation determines such a change is reasonable and in conformity with criteria promulgated by the Florida Department of Transportation, except that no changes shall be made on state highways or connecting links or extensions thereof; which shall be changed only by the Florida Department of Transportation.
(b) All speed zones shall be posted with clearly legible signs. No change in speeds from 30 miles per hour shall take effect until the zone is so posted by the town. All signs which limit or establish speed limits, maximum and minimum, shall be so placed and so painted as to be plainly visible and legible in daylight or in darkness when illuminated by headlights.
(§ 316.189, Fla. Stat.) ('75 Code, § 16-7)