A technical fault left Tower Bridge stuck open earlier this week with cars and pedestrians left either side of the bridge.
The bascules jammed upright after being opened to allow a Jubilee Trust Tall Ship to pass through.
The fault brought traffic in part of central London grinding to a halt with people wanting to cross having to turn back or wait. Police are advising drivers to avoid the area.
Three double-decker buses without passengers that were parked on Tower Bridge were forced to back up as it remained closed.
Tourists and members of the public were told by bridge staff it could be up to three hours before the famous London landmark reopened, reports ITV.