In this paper, a rotatable road sign using a shear key structure is developed in order to ensure the safety of road sign structures. To reduce the wind load, a shear key structure is installed in the middle of a road signstructure to enable rotating in the event of typhoons or blasts, etc. If a wind is blown over the design wind speed, the road sign structure rotates on its inner steel pipe. Thus, the wind load is drastically reduced. Thetechnology proposed in this paper could be used for the safety of a road sign structure because the distributed area of wind load, which is the main load of the road information sign support structures, is minimized. For applicability, a rotatable road sign using the shear key structure is demonstrated in a real in-field expressway. It is concluded that the proposed rotatable road sign will provide rational and practical solutions for the safety and reducing car accident in case of road facility failures.
Abstract