Concrete bollards will block traffic from crowds in central London on New Year’s Eve to prevent a potential lorry attack.
Extra security measures are in place ahead of tonight’s celebrations, after this month’s terror attack on a Christmas market in Berlin.
A record number of concrete bollards will be placed at junctions to keep vehicles out of central London.
Armed police will also be deployed on London Underground trains for the first time on New Year’s Eve following a review of security.
The armed officers and other additional patrols have been brought in to bolster the 3,000 officers who will police the capital’s streets.
UK authorities say they are not responding to any specific intelligence of a threat, but are taking precautions after recent events in Europe.
In July, Mohamed Lahouaiej Bouhlel killed 86 people when he drove a 19-tonne lorry into crowds on Nice’s seafront promenade.
Then, earlier this month, Anis Amri killed 12 people when he drove a hijacked lorry into a Berlin Christmas market.
In response to that attack police in the German capital have closed the Pariser Platz square in front of the Brandenburg Gate.
They are deploying 1,700 extra officers, as well as armoured cars and concrete barriers blocking off the area.
The Metropolitan Police confirmed that security plans for the capital’s New Year’s Eve celebrations – had been “adjusted” in the last few days.