A stick assembly for a traffic use includes a handle having an inside formed with a receiving space, a battery unit mounted in the receiving space of the handle, at least one circuit controller mounted in the receiving space of the handle, a tube mounted on a first end of the handle, and a plurality of light-emitting members mounted in the tube and connected to the circuit controller. Thus, the multifunctional stick assembly functions as a baton, a flashlight and a stun gun and can be used to supply an auxiliary electric power.