Here's what the Dartford Crossing will look like when the tolls disappear later this year. From October, ANPR technology will be used to charge drivers - similar to the way the London Congestion charge works.
Driver will also be able to pay online, at selected shops or by phone. The crossing will still be free to use between 10pm and 6am.
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Hundreds of passengers were ordered to leave the terminal building and flights grounded after passengers suffered difficulties breathing.
Council leaders today called on the government to provide extra money to help resettle the youngsters in the capital.
An eyewitness said: "It was very unnerving. It was just after 12pm and there were suddenly police vans and cars everywhere."