Olympic Delivery Authority chairman John Armitt has spoken again of the huge safety challenges being faced on the Olympic site in 2010.
Since the project started, the ODA has achieved one million hours worked without a reportable accident on eight occasions.
But Mr Armitt said: “There are still huge challenges ahead of us as we enter our toughest year.
“The number of workers and activity on site will reach their peak with construction underway in every part of the Olympic Park.
“The logistical challenge is huge with the workforce increasing to around 11,000, and deliveries increasing from the current rate of around 650 per day to around 1,000 per day.
“We cannot afford any complacency, but I am confident that with what we have achieved to date the foundations for success are firmly in place.”