 The ancient city of Kollam, then known as Quilon, was an important center for trade with the Chinese.The Chinnakada Underpass is a public road infrastructure project for the city of Kollam as part of the Kerala Sustainable Urban Development Project supported by the Asian Development Bank (ADB) to ease traffic congestion at Chinnakada, the city CBD of Kollam.The presence of an existing Railway over bridge and three close intersections with heavy traffic limits the option for traffic management measures including junction improvement.