The chief executive of High Speed 2, Alison Munro, has said that new data on the number of people that will be affected by the rail project are based on a "worst case" scenario.
She said she expected to minimise the number of lorries travelling to and from the construction project by re-using 95% of the material that is excavated.
More top news
A man, apparently armed with a small axe and a large stick, was detained close to the event and police cleared the area as a precaution.
A remarkably mild night
Thousands of people have gathered in the centre of Manchester for a vigil in the wake of the terror attack.