The VTA's BART Silicon Valley Extension includes a Phase I, currently under construction, spanning 10 miles and costing $2.3 billion, with a forecasted opening in fall 2017. Phase II is projected to cost $4.7 billion, with expected daily ridership hitting 55,000 by 2035, although additional funding is necessary to complete the project. Funding sources will include federal assistance and local revenue from the Measure A sales tax instituted in 2006, which has $2.9 billion remaining for projects and financing.