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 closed to the public in its entirety for a period of two days. The Pennsylvania Avenue closing has been opposed by organized civic groups in Washington, D.C. They argue that the closing impedes traffic flow unnecessarily and is inconsistent with the well-conceived historic plan for the city. As for security considerations, they note that the White House is set much farther back from the street than numerous other sensitive federal buildings are. Prior to its inclusion within the fenced compound that now includes the Old Executive Office Building to the west and the Treasury Building to the east, this sidewalk