When lane-direction-control signals are placed over the individual lanes of a street or highway, vehicular traffic may travel in any lane over which a green signal is shown, but shall not enter or travel in any lane over which a red signal is shown. (Acts 1980, No. 80-434, p. 604, §2-105.)
Lane-Direction-Control Signals
Ala. Code § 32-5A-35, under Traffic Signs, Signals and Markings.
Ala. Code § 32-5A-35