19th Avenue in San Francisco, California, is an 8 km (5 miles) long, six-lane arterial thoroughfare that bisects the southwestern part of the city.
It begins at the southern edge of Golden Gate Park in the Sunset District, as the continuation of Crossover Drive, which cuts through the park north-south. After running through the Sunset District to Sloat Boulevard, it continues south, passing Stonestown Galleria and San Francisco State University and reaches Junipero Serra Boulevard. It then passes Junipero Serra and finally ends at the western border of Ingleside neighbourhood. Despite being a city street, the avenue between Golden Gate Park and Junipero Serra Blvd. is designated as part of the State Highway 1. The portion of the avenue between Eucalyptus Drive and Junipero Serra Boulevard is also run by the Muni Metro M Ocean View light rail, providing access to Downtown. 19th Avenue is located between 18th Avenue and 20th Avenue.
State Senator Leland Yee authored a bill designating 19th Avenue as a double-penalty zone for overspeeding, illegally overtaking, driving under the influence, driving recklessly, seat belt violations, and other traffic offences enforced by California Highway Patrol San Francisco Division, which took effect on 1 January 2009. Previous legislative efforts were vetoed by Governor Arnold Schwarzenegger in 2006 based on grounds that double-fine zones are ineffective without necessary safety measures. In 2007, the bill failed to come to a final vote before the Senate session ended. On 22 February 2008, Yee successfully reintroduced the bill.