Traffic deck construction expected to take 6 months for new Vancouver Broadway subway line Richard Zussman It's full steam ahead on the construction of the Broadway subway line in Vancouver. The six-stop extension going from Commercial station mostly along Broadway to Arbutus Street is set to be completed in 2025. The Broadway project is currently projected to cost $2.8 billion. The work being done now is to build the station decks at the six locations before starting the tunneling preparation in the fall and boring in mid-2022. The biggest worry from the province is traffic disruptions, something they optimistically hope can be kept to a minimum.