carbon emissions. Muni's current hybrid bus fleet currently runs on biodiesel. On July 17, 2009, a Muni LRV rear-ended another at West Portal Station. That accident injured 48 people. On December 5, 2009, the Muni system underwent its most extensive changes in over 30 years, in an attempt by the SFMTA to reduce its budget shortfall. This involved changes to over 60% of its bus and light rail routes, including the elimination of six bus routes. Changes included reduced frequency of service, shortened or altered routes, and earlier termination of service, although a few of the busiest lines, such as the 38 Geary, saw service increases. 2010s The 2010s started with severe cuts to Muni service. On February 26, 2010, the SFMTA board, which oversees Muni operations, voted for Muni to undergo further extensive changes in a further attempt to reduce its budget shortfall. Months after the cuts were enacted, significant portions of the service were restored through additional funding and cutting operational costs. Further improvements were made throughout the decade, amidst changes in both city and agency leadership, with the implementation of the "Muni Forward" project and all-door boarding. In 2011, Nathaniel Ford, the head executive of the SFMTA, stepped down and Ed Reiskin took his place. After the difficult cuts in 2010, city leaders cited the "Transit Effectiveness Project", later rebranded as "Muni Forward", as a priority for improving service on Muni. In April 2015, the SFMTA launched the implementation of Muni Forward. Service changes involve renaming routes designated as "Limited" to "Rapid", a redesigned system map, and increased levels of service on the busiest bus routes. Infrastructure improvements include the addition of transit signal priority, bus bulbs, and bus-only lanes to more locations, and trackway repairs along the Muni Metro system. The 2010s also included the start of construction on bus rapid transit projects on Van Ness and Geary Streets and the initiation of planning for new subway extensions that would potentially reach the Marina District and Park Merced. On July 1, 2012, Muni was the first transit agency in North America to implement all-door boarding throughout its system. The practice already existed in the Muni Metro as Proof-of-Payment, and was expanded to include all bus service. With the Breda cars approaching 20 years of use, the SFMTA announced an order in 2014 for 175 new Siemens S200 cars for its Muni Metro lines. The first of