Construction of a 2 . 2 km long dual 2 - lane carriageway between northwest tsing yi interchange and tam kon shan interchange linking tsing yi north bridge ; construction of an in - situ viaduct at tam kon shan and 3 nos 兴建一段介乎青衣西北交汇处与担杆山交汇处连接青衣北桥的2 . 2公里长的双程双线分隔行车道