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Construction of a dual 2-lane carriageway from Cheung Pei Shan Road at Shek Wai Kok to Castle Peak Road at Tsuen King Circuit; widening and upgrading of the existing section of Castle Peak Road between Tsuen King Circuit and Chai Wan Kok to dual 4-lane carriageway together with a flyover to connect Castle Peak Road with Tuen Mun Road at Chai Wan Kok Interchange.