汲水門
Some international airports require construction of additional infrastructure outside of the airport, such as at the Hong Kong International Airport, which included the construction of a high-speed railway and automobile expressway to connect the airport to the urban areas of Hong Kong. Construction of the expressway included the construction of two bridges (the Tsing Ma suspension bridge and Kap Shui Mun cable bridge) and the Ma Wan viaduct on Ma Wan island to connect the bridges. Each bridge carries rail and automobile traffic.