High Quality Content by WIKIPEDIA articles! FasTracks is a twelve-year, $6.5 billionpublic transportation expansion plan, currently under construction, for the Denver-Aurora and Boulder metropolitan areas in Colorado, USA, developed by the Regional Transportation District. The plan calls for six light rail, diesel commuter rail, and electric commuter rail lines with a combined length of 119 miles (192 km) to be opened between 2013 and 2016 to provide commuters an alternative to the region`s congested roads and highways. It expands on previous transportation projects, notably T-REX. The plan also includes the expansion of existing light rail stations, the addition of a bus-based rapid transit route between Denver and Boulder, and the addition and expansion of bus routes and parking facilities to support the new rail lines.