O.C.G.A. § 38-2-273: Free passage through tollgates, tunnels, toll bridges, and ferries while under orders.

Any person belonging to the organized militia shall, together with the conveyance and property of the state or of the United States in his charge, be allowed to pass free through all tollgates and tunnels and over all toll bridges and ferries if he is in uniform and presents an order for duty or certificate of an order for duty.