sentences:  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.