Two tunnels and a bridge have been constructed at Dartford to allow people cross the River Thames. When work on the crossings took place in the 1950s a lot of workers suffered daily from decompression sickness, also known as 'The Bends'.
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Despite all the hype, the M25 isn't even a full circle. The Dartford Crossing (comprising the Dartford Tunnels and the Queen Elizabeth II Bridge) over the Thames in the east and its approach roads are designated A282, because the first Tunnel was built in the 1960s as a local connection.
The Dartford Crossing itself is on the road labelled A282. If you wish to avoid taking the crossing, travelling southbound, you must exit the motorway at Junction 30, taking the A13 west into London central or A13 east towards Stanford-le-Hope and Southend-on-Sea.
Currently, the Government does not have any intentions to eliminate the road user charge at the Dartford Crossing. In response to a now-closed petition, the Government stated that the charge exists to manage the demand for the crossing.