Project due to the initiative Boromratchonni elevated highway. A wide four-lane elevated distance of about 14 kilometers across and parallel to Rama. Amarin Intersection to Rama the second built in the year 2538 to alleviate traffic problems at Saphan Phra Nakhon side. Affecting the Silom and Sathorn Road. The Thonburi to affect the Rama and suburban streets.