2028年夏季奥林匹克运动会

Metro E Line train in Downtown Los Angeles

The Twenty-eight by '28 initiative is an effort set forth by Mayor Eric Garcetti that the Los Angeles County Metropolitan Transportation Authority complete 28 transit infrastructure projects before the start of the games.[11] Most of these projects were already in the planning stages but will receive accelerated priority, while several new projects were programmed with the initiative.

As of 2019, the K Line light rail had been expected to open and be fully completed by 2021; revenue operation has since been delayed to late 2022. It will link the Crenshaw District, Inglewood and Westchester once completed. The K line will also connect to a people mover being constructed to link Los Angeles International Airport with the Aviation/96th Street station. The construction of the people mover will be expedited in anticipation of the 2028 Olympics, with a completion date of 2023 being set.[12] The LAX people mover started construction in early 2018 and the K Line is currently 99.5% completed (as of January 2022).[13] The Inglewood Transit Connector is another people mover planned to provide transportation between the K line and the Olympic venues in Inglewood.

While various infrastructure improvements were planned regardless of the outcome of the Los Angeles Olympic bid, the extension of the Metro D Line will be expedited to serve the 2028 Olympics. Three phases were created to extend the line. The first phase will extend the D Line from the Wilshire/Western station to the new Wilshire/La Cienega station. This phase will be completed by 2023. The second phase will extend the D Line to Century City by 2025, while the third and final phase will extend the line to the West Los Angeles VA Medical Center in Westwood with a completion date set for 2026. The third phase will also include a station adjoining the UCLA campus, connecting the Olympic village and Pauley Pavilion with venues in downtown Los Angeles.[14][15] Currently phase one, two and three broke ground and are under construction. Phase 3 did not have a "ground breaking ceremony", but did receive its federal funding grants in February 2020. Construction began in 2019 and remains on schedule.[14][16][17]

The Regional Connector in downtown Los Angeles will be complete in 2022. The project will connect the Metro E Line, which already links venues in Downtown Santa Monica to venues at Exposition Park and in downtown Los Angeles, to the Metro L Line. This will allow for direct rail service between Santa Monica and East Los Angeles. The Regional Connector will also link the Metro A Line with the Metro L Line, connecting the Long Beach area and San Gabriel Valley via downtown.[18][19]

These infrastructure improvements, among others, are being funded by "Measure R", a temporary half-cent sales tax increase, and "Measure M", a continuation of Measure R's tax increase plus an additional permanent half-cent sales tax increase, both tax measures applicable to Los Angeles County.[20] Measure R was approved by voters in November 2008 and Measure M was approved by voters in November 2016.[20]