Pennsylvania Avenue lighthearted celebrations, including a series of day- and nighttime Shriner's parades in the 1920s and 1930s. Thomas and Concepcion Picciotto are the founders of the White House Peace Vigil, the longest running anti-nuclear peace vigil in the US, at Lafayette Square on the 1600 block of Pennsylvania Avenue. After the Oklahoma City bombing in 1995, the Secret Service closed the portion of Pennsylvania Avenue in front of the White House to all vehicular traffic. Pedestrian and bicycle traffic, however, was still permitted on the sidewalk. After 9/11 this policy was made permanent. Near the White House traffic is redirected to
Pennsylvania Avenue Line (Washington, D.C.) cars, and cars of other lines that ran to Georgetown, being routed via Pennsylvania Avenue between Georgetown and the White House. Other lines, such as the Columbia Line between the White House and Kenilworth, were extended over the Pennsylvania Avenue Line. When numbers were assigned to the car routes in 1936, the following regular routes used the Pennsylvania Avenue Line: In addition, Route 92 served the line on Eighth Street Southeast to the Navy Yard via the Florida Avenue Line, but did not use Pennsylvania Avenue. Thus Pennsylvania Avenue Line streetcars (Route 30) were discontinued on January 3, 1960, and