A3 and A3(M)


The A3 is the historic route south-west from London to Portsmouth, connecting the capital with the home of the navy, and thanks to a steady programme of upgrades since the early part of the 20th Century, it still is, and today it's virtually a motorway from the city to the coast.


M25 J10 Improvement 28 August 2017

Upgrade work at M25 junction 10, where the motorway crosses the A3. The scheme is intended to relieve the chronic congestion suffered at this busy junction. At present all turning traffic passes through one large signalised roundabout which is operating beyond the limits of its capacity for significant parts of the day.

A large number of options were considered for the work, including radical plans to replace the junction entirely with a new free-flowing four-way interchange of one type or another. However, there are now two options remaining which have gone out to consultation.


A3 Hindhead Tunnel 29 July 2011

Realignment of the A3 into dual two lane bored tunnels, and grade-separation of the junctions at each end of the Hindhead section, removing the final section of single-carriageway between London and Portsmouth and the notorious Devil's Punchbowl hill. The scheme also removes traffic from an Area of Outstanding Natural Beauty.

The tunnel, when complete, will be the longest road tunnel in the UK.

There will be a Traffic Restriction Order in effect, prohibiting pedestrians, cycles, invalid carriages, animals and motorcycles under 50cc.