O.C.G.A. § 40-6-75: Highway construction and maintenance personnel and vehicles.

(a) The driver of a vehicle shall yield the right of way to any authorized vehicle or pedestrian actually engaged in work upon a highway within any highway construction or maintenance area indicated by official traffic-control devices.

(b) The driver of a vehicle shall yield the right of way to an authorized vehicle actually engaged in work upon a highway whenever such vehicle displays flashing or revolving amber lights and has a permit to use such amber lights.