QUEEN ELIZABETH II BRIDGE
The minimum headway between the main piers is close to the southern pier. The limits of a passage 100m wide with a minimum headway of 53.9m above MHWS are marked by white isophase lights (occas). Vessels wishing to take advantage of this additional headroom should contact Port Control London VHF channel 68 or Telephone 01474 560311. 
Bridge Safety Zone: vessels must obide by General Directions for Navigating in the Port of London, Port Information Guide, section: Navigational Restrictions and Exclusion Zones.