People using cars to cross the Tunnel rose by 10% to 820, 484 people, but the number of coach passengers fell.

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The research was carried out by archaeologists Jim Leary and David Field, who dug a cross-section tunnel into the monument in 2007.

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The Dartford Tunnel and Queen Elizabeth II bridge cross the River Thames between Dartford and Thurrock.

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The Dartford Tunnel and Queen Elizabeth II bridge cross the River Thames between Dartford and Thurrock, forming a link in the M25 motorway, carrying about 150, 000 vehicles a day.

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The city hired the consultant Parsons Brinckerhoff in early 2011 to study the merits of extending the subway, shortly after New Jersey Gov. Chris Christie canceled the planned "Access to the Region's Core" cross-river tunnel project, which was a blow to those who believe the region is hampered by the limited capacity for trains crossing the Hudson between Manhattan and the suburbs.

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At allotted points around the tunnel, the proton beams cross paths, smashing into one another.

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"At King's Cross station there is a rescue operation in the tunnel down on the line, " he said.

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In January 1994 the then Transport Secretary, John MacGregor, told MPs that Union Railways - the company set up to construct the Channel Tunnel link - had concluded that "St Pancras is preferable to King's Cross as the terminus on environmental, operational and commercial grounds".

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