Located between Amarit Road and Phakdi Damrong Road. It is Thailand's first mountain tunnel. Made of reinforced concrete, 273 meters long, 9 meters wide and 7 meters high, with two traffic lanes. Opened on January 1, 2001. During the night, the lights will be turned on to facilitate traffic. Inside the tunnel, there are pedestrian walkways on both sides of the car lane. For short walks to the other side of the tunnel and watch the decorated lights