Wind tunnel experiments were performed in order to clarify the features of airflow in the street canyon, which consists of the regularly aligned rectangular blocks with two different heights. 3-dimensional wind velocities around the blocks were measured with split-film probe. Following conclusions were reached 1. The horizontal vector of airflow on the road, which is parallel to the main wind direction, bends remarkably in the case of normal street pattern. This phenomenon is more clearly observed in the case with narrow road. 2. The backward airflow area in the case of staggered street pattern is larger than that in the case of normal street pattern. 3. Under the eaves of the high blocks, the turbulence intensity increases remarkably.
