John Thomas, chairman of the Licensed Taxi Drivers Association, questioned why the VIPs had not been given hotels closer to the Olympic sites to avoid the need for such measures.
“London will be totally and completely gridlocked,” Thomas said.
London Mayor Boris Johnson has dismissed such fears as “complete and utter nonsense,” but traffic monitoring company Inrix forecasts a 33 percent increase in jams during the end of July and the beginning of August.
Tony Travers, a transport expert at the London School of Economics, said it was very difficult to predict how the transport network would cope.
“We’ll only find out when it happens,” he said.