Metro Transit was created by referendum in 1972 to operate a district-wide bus system and resume planning for a Seattle and Eastside transit system to be built with the new floating Interstate 90.  A transit element for the new floating bridge was requested by the Puget Sound Council of Governments and a group of local seattle and Eastside politicians to avoid further traffic.  A Memorandum of Understanding signed by the Washington State Highway Commission, Metro Transit and local governments in late 1976 characterized the centre of the two-lane eight-lane bridge for transit traffic and the inhabitants of Mercer Island with a possible transition to a fixed guidance system in the future.   The Puget Sound Council of Governments (PSCOG), a regional planning organization, found in a 1981 study that the urban streetcar would be a viable way to decongest traffic on the Interstate 90 corridor and recommended that Metro incorporate it into its long-term plan.  A 1986 joint study by Metro and PSCOG examined several alternative routes for an eastside tram system, which recommended crossing Interstate 90, which came from downtown Bellevue to Kirkland and Bothell via the Eastside Railway and Downtown Redmond via State Route 520.   While the streetcar plan was not funded, arrangements were made to accommodate a future Eastside tram link in the Seattle Underground Tunnel, which opened in 1990.  Sound Transit added the high-capacity Eastside project in 2004 to its temporary long-range plan and explored several corridors and concept modes that veered off a main line on Interstate 90.  The Bellevue-Overlake Corridor was chosen in July 2005 as the preferred route for the Eastside line, which should be either urban streetcar trains or a high-speed bus train system that could be converted to rail.   The urban train was chosen as the preferred mode by Sound Transit in July 2006, after being supported by Councillors Bellevue, Kirkland and Redmond.  The $3.9 billion streetcar project, known as the East Link, would be part of the next regional transit election operation from Seattle to Bellevue, the Microsoft campus and downtown Redmond.  A 24 km segment of East Link was included in the $47 billion train that combined sound transit projects and the highway extension as part of the 80 km tram. The plan calls for the Seattle StreetCar to travel to Overlake Hospital Medical Center east of downtown Bellevue in 2021, followed by an extension of the Microsoft campus in Overlake to 2027; The segment between Overlake and downtown Redmond would be a priority for future expansion with additional resources, with engineering and property acquisition work covered by the road and transit package.
  The package faced opposition from environmentalists, developer Kemper Freeman and Elected Eastside officials who failed in the November 2007 election.  G. Length of contract.