Outdoor seating in urban viaducts plays a subtle yet significant role in shaping the microclimate of these structures. By altering airflow patterns and providing shade, seating arrangements can either mitigate or exacerbate the urban heat island effect. The materials used for benches—such as metal, wood, or concrete—absorb and radiate heat differently, influencing localized temperatures. Additionally, the placement of seating can disrupt wind tunnels common under viaducts, creating pockets of cooler or warmer air. Studies suggest that strategically designed seating can improve thermal comfort for pedestrians while reducing energy demands for nearby buildings. However, overcrowded seating may trap heat and humidity, worsening microclimatic conditions. Urban planners must balance functionality with climate-conscious design to optimize these spaces.