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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The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.
The family of the police officer who was murdered in the Westminster attack have thanked those who were with him 'in his last moments'.