If these factors have any impact on the expected traffic and toll revenue on CityLink and the West Gate Tunnel, this could also incur a financial penalty for the state government, according to the annual report. Set to open in 2022, the road is designed primarily to relieve pressure on the West Gate Bridge, which carries up to 220,000 vehicles a day. In exchange for its role building the toll road, Transurban has been promised a 10-year extension on CityLink tolls and a 4.25 per cent lift in tolls over the decade, which amounts to a 20 per cent real toll increase, Macquarie Bank has found.