on January 14, 2007. The work carried out over the next two years included the addition of light rail tracks and widening, to three lanes, all of the few south-of-Burnside sections which had previously been intentionally narrowed (by the original 1970s design) to two lanes and bus-only. During the lengthy closure, all bus routes using the mall were diverted to other streets, many to the nearby pair of 3rd Avenue (southbound) and 4th Avenue (northbound), where they had to share all traffic lanes with private vehicles but with parking temporarily removed at all of the new bus stops. Some routes were cut back to the southern part of downtown, making a loop along Columbia and Jefferson Streets. In 2007, local officials and businessmen expressed confidence that the renovation and extension of the transit mall would foster major new property redevelopment in downtown over the next several years. Bus service returned to the mall on May 24, 2009. Three months later, on August 30, 2009, MAX light rail began serving the mall, when the Yellow Line was shifted from its original (2004) downtown routing. On September 12, 2009, the new Green Line opened, and it serves the transit mall as well. In the new design, MAX stops are located every 4–5 blocks, and a bus (on a given route) also stops only every 4–5 blocks. Groupings of stops are marked by letters: A, B, C or D on 5th Avenue, and W, X, Y or Z on 6th Avenue. All of the few routes that were shortened slightly, to terminate in the southern part of downtown upon the mall's closure for rebuilding in 2007, have been permanently revised so as to no longer serve the mall, where replacement service is now being provided by light rail. The mall is currently served by 17 TriMet bus routes, six of which only operate in peak hours (at least on that part of their route). Only one 1977 shelter survived demolition; located near Southwest 5th and Salmon streets, it was spared as a reminder of the previous transit mall, later re-purposed as a concession stand. Although cars and trucks are now allowed to use the left lane for the entire length of the transit mall, they are—with the exception of a very few locations—not permitted to turn right at any intersections. A motorist wanting to turn right from the transit mall must turn left,