Ala. Code § 32-5A-113: Authority to Designate through Highways and Stop and Yield Intersections.

The Department of Transportation with reference to state highways and local authorities with reference to highways under their jurisdictions may erect and maintain stop signs, yield signs, or other official traffic-control devices to designate through highways, or to designate intersections or other roadway junctions at which vehicular traffic on one or more of the roadways should yield or stop and yield before entering the intersection or junction.