Updated

London's mayor says residents should ignore naysayers warning of transport gridlock during the Summer Olympics next year.

Mayor Boris Johnson says the chaos predicted will fail to materialize. He says those who fear trouble are merely "gloomadon poppers," a term defined by his office as people who habitually put out negative news.

Known for his colorful language, Johnson lashed out at transport critics on Monday. He told delegates at the London Policy Conference that it was "complete and utter nonsense" that people will find it impossible to move around.

London's aging and overcrowded subway, rail and road network has been the subject of scrutiny in the runup to the event, which takes place July 27-Aug. 12.