Fifth and Sixth avenues within downtown comprise the Portland Transit Mall, two streets devoted primarily to bus and light rail traffic with limited automobile access. Opened in 1977 for buses, the transit mall was renovated and rebuilt in 2007–09, with light rail added. Starting in 1975 and lasting nearly four decades, all transit service within downtown Portland was free, the area being known by TriMet as Fareless Square, but a need for minor budget cuts and funding needed for expansion prompted the agency to limit free rides to rail service only in 2010, and subsequently to discontinue the fare-free zone entirely in 2012.