Moveable barriers are in permanent use in such cities as Auckland (Auckland Harbour Bridge); Philadelphia, Pennsylvania; New York; Honolulu, Hawaii; San Juan, Puerto Rico; Boston, Massachusetts; Washington, D.C.; Dallas, Texas; San Diego, California; and Sydney, Australia; many other cities use them temporarily during construction work.
The DRPA temporarily closed the walkways to the public the day after the 7 July 2005 London bombings, citing security concerns.