The lighting towers – each weighing 34 tonnes and designed with integrated walkways, access, power supplies, cabling and lighting – were installed over a three-week period.
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They will illuminate the action on the filed of play and help capture high-definition footage. The towers are located high above the Stadium roof to ensure optimum lighting angles, which avoid dazzling spectators, photographers and competitors.
ODA Chairman John Armitt said: "We still have big challenges over the coming year but hitting this important milestone ensures we remain on track to complete construction a year before the London 2012 Games begin."
The cable-net roof can now be covered with a fabric material, providing the correct conditions for athletes on the field of play and covering two-thirds of spectators.
(CD/GK)
