and make two additional left turns, to end up in the desired direction. This prevents cars' making right turns into the path of an oncoming bus or light rail car, which might be unable safely to stop in time to prevent a serious collision. Vintage Trolley service On September 13, 2009, the Sundays-only Portland Vintage Trolley service moved to the transit mall from a different route it had followed since 1991. The trolley cars served the full length of the mall, from Union Station to Portland State University. However, the Vintage Trolley service was discontinued in 2014, running for the last time on July 6 of that year. MAX Mall Shuttle The MAX Mall Shuttle was a service that operated from 2009 until 2011, weekday afternoons only. Introduced on September 14, 2009, it supplemented the light-rail service provided on the mall by the Yellow and Green lines and operated only between Union Station and PSU, about every 30 minutes on weekdays from noon until 5:30 p.m. TriMet discontinued this supplementary shuttle service effective June 5, 2011 (making Friday, June 3 the final day of operation). Along with bus service, the mall continues to be served by two MAX lines in each directionGreen and Yellow northbound and Green and Orange southboundwhich provide a combined average headway of 7.5 minutes in each direction at most times. See also Fareless Square List of TriMet transit centers MAX Light Rail Portland Streetcar Transportation in Portland, Oregon References Sources External links TriMet home page Portland Mall page at TriMet 1977 establishments in Oregon MAX Light Rail Northwest Portland, Oregon Southwest Portland, Oregon TriMet