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
White House the Oklahoma City bombing of April 19, 1995, the United States Secret Service closed off Pennsylvania Avenue to vehicular traffic in front of the White House from the eastern edge of Lafayette Park to 17th Street. Later, the closure was extended an additional block to the east to 15th Street, and East Executive Avenue, a small street between the White House and the Treasury Building. After September 11, 2001, this was made permanent in addition to closing E Street between the South Portico of the White House and the Ellipse. In response to the Boston Marathon bombing, the road was