The RAC is warning that from noon tomorrow, roads from Park Lane to Trafalgar Square will be subject to rolling closures to let the demo pass. "We are asking people to avoid the area, " said a spokesman. "There will be significant delays." Demonstrators will gather at Speaker's Corner from noon and begin their march in Park Lane from 1pm, passing the US Embassy in Grosvenor Square. The march ends with a rally in Trafalgar Square. The 11th national demonstration since the war began marks the second anniversary of the start of bombing in Iraq.