The Improvements to San Tin Interchange (the Project) is located at the current San Tin Interchange in the San Tin region of the North-West New Territories.  The Project includes two elevated slip roads proposed from westbound Fanling Highway and eastbound San Tin Highway to merge to form a 4-lane carriageway and then connect to San Sham Road leading to the existing vehicle holding area at the Lok Ma Chau Boundary Crossing. 

The Project area is generally rural in nature, with the surrounding land comprising village houses at Tung Chan Wai, Wing Ping Tsuen and Tai Fu Tai, and open storage areas for containers and temporary car parks along Kwu Tung Road and Castle Peak Road.