upon completion of the automated train control system and the Muni Metro Turnback; however, this was never implemented even after the construction projects were finished. Later changes In 2010, Muni replaced the rail junction just south of St. Francis Circle station. Rail service south of West Portal station was replaced with buses from May 17 to September 4. The line was temporarily replaced by buses from June 25 to August 24, 2018 due to the Twin Peaks Tunnel shutdown. During that time, a new traffic signal with transit signal priority was installed where the line crosses the northbound lanes of 19th Avenue at Rossmoor Drive, and red transit-only lanes were painted to indicate that drivers must not block the crossing. Service modifications during COVID-19 On March 30, 2020, M Ocean View light-rail service was replaced with buses due to the COVID-19 pandemic. Light-rail service on the M resumed on August 22, 2020, with the routes reconfigured to improve reliability in the subway. M Ocean View and T Third Street service were interlined, running between Sunnydale station and San Jose and Geneva (Balboa Park station). M Light-rail service was re-replaced by the M Bus on August 25 due to issues with malfunctioning overhead wire splices and the need to quarantine control center staff after a COVID-19 case. M rail service resumed on August 14, 2021, with the line terminating at Embarcadero again, as the K and T are again interlined. Subway expansion proposals The M Ocean View moves at only during afternoon commute hours over a distance along 19th Avenue/Highway 1. The slow speed is attributed to trains stopping at multiple busy street crossings. In addition, the majority of riders access 19th Avenue stops from the west side of 19th, since Stonestown Galleria, San Francisco State University and Parkmerced are all located west of 19th. In order to access the stops, which are located in the median of 19th Avenue, pedestrians cross three lanes of traffic and a turn lane. In San Francisco, 55% of severe and fatal pedestrian accidents occur on 7% of its street miles, which includes the 19th Avenue/Highway 1 corridor. In response, the San Francisco County Transportation Authority published studies in 2010 and 2014 which explored options to facilitate pedestrian access and improve travel times. The full-subway option was chosen for further development and named the Muni Subway Expansion Project (MSXP). Under the preliminary concept for MSXP,