The Cross City Tunnel is a 2.2-kilometre long (1.4 mi) twin-road tunnel tollway located in Sydney, New South Wales, Australia. The tunnel links Darling Harbour on the western fringe of the central business district to Rushcutters Bay in the Eastern Suburbs. Each of the twin tunnels has a different alignment, with the westbound tunnel running underneath William and Park Streets and the eastbound tunnel running underneath Bathurst Street.

William Street is a 1.4-kilometre-long (0.87 mi) major thoroughfare in Sydney, New South Wales, Australia. The street was named in honour of king William IV of the United Kingdom of Great Britain and Ireland upon its opening in 1834.