Abstract: A traffic warning device comprising: a base for mounting to a vehicle and defining base first and second ends; a deployable element mounted to the base and movable relative thereto between a parked position, a first deployed position and a second deployed position, wherein, in the parked position, the deployable element extends along the base and is substantially centered relative thereto, in the first deployed position, the deployable element is offset from the base and protrudes therefrom at the base first end, and, in the second deployed position, the deployable element is offset from the base and protrudes therefrom at the base second end. The deployable element is provided with visible traffic warning elements. The deployable element is deployable on opposite sides of the vehicles by being moved respectively to the first and second deployed positions.