In this paper, forms and dimensions of noise barrier which is able to reduce not only road traffic noise but also wind load placed on a bridge is investigated. Through one-fourth scale model experiments in anechoic room, it was concluded that louver made of steel must be covered with absorptive materials of 1cm thickness and the intervals of its members must be less than 50cm in order to get enough noise reduction. And the scale model tests in two dimensional wind tunnel indicated that the proposed noise barrier decreased the amount of wind load to about 60%.