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.) were made around the White House to the north and east via 15th Street Northwest and around the south edge of the Capitol Grounds. At the time, this meant that it turned south along the current western boundary (First Street West) between the two traffic circles, but continued to curve southeast and east to the intersection of A Street South and First Street East, where Pennsylvania Avenue restarted. The line continued along Pennsylvania Avenue to Eighth Street Southeast, turning south to end at the Navy Yard. A branch to the Baltimore and Ohio Railroad station ran northeast from Pennsylvania Avenue