The longest road tunnel in the UK
The Lower Thames Crossing would be the longest road tunnel in the UK, stretching 2.6 miles
14.3 miles of new road
The route would include 14.3 miles of new road connecting the M25, A13 and M2
New bridges and viaducts
Around 50 new bridges and viaducts would be built
On the south side of the River Thames, the new road would link to the A2 and M2 in Kent. On the north side, it would link to the A13 in Thurrock and the M25 in Havering.
The tunnel crossing would be located to the east of Gravesend on the south side of the river, and to the west of East Tilbury on the north side.
The tunnel would be made up of two 2.6 mile (4.3km) tunnels crossing beneath the river, one for southbound traffic, one for northbound traffic.
Explore our interactive map of the route and development boundary
- The black lines shows the proposed route
- The red line shows the development boundary – the area of land needed to build and operate the road
- The brown lines show earthworks (slopes and bunds)
Route developments and Map Books
It will pass beneath the River Thames with its southern entrance located to the east of the village of Chalk, and its northern entrance to the west of East Tilbury. On the northern section, the tunnel will pass under the East Tilbury Marshes.
The tunnel details
Click on the numbered icons in the image below to view more information.
Proposed tunnel images
The following images show the proposals for the section of the route north of the river in Thurrock and Essex.
The route continues passing by West Tilbury, Linford and Chadwell St Mary to approach a new junction layout between the Lower Thames Crossing, A13 and A1089. It will be located at the site of the existing junction between these roads to the west of Orsett.
The new route will pass under the A13 to the east of the existing A1089 bridge. The existing connections between the A13 and A1089 will all be retained with some modifications. A short section of the new route will reduce to two lanes in both directions around the A13 junction.
Beyond the A13 junction the route would continue north west of Orsett turning further west.
The route would continue across the Mardyke river and Golden Bridge Sewer. It would then connect with the M25. The junction with the M25 will be located just under two miles (3km) south of junction 29 on the M25, near Ockendon Road.
The junction will have slip roads for northbound LTC traffic to join the M25 and southbound M25 traffic to join the LTC.
A short section of the M25 will be reduced from four lanes to three lanes.
Improvement work will also be carried out on the M25 between the new junction and junction 29.
M25 junction 29
Beyond the northern section of the Lower Thames Crossing, improvement and modification works will also be needed at junction 29 on the M25 and to the north of junction 29.
The M25 through junction 29 will be widened from three lanes to four in both directions with hard shoulders.
The connections of the north-facing slip roads at this junction will be changed because of the widening through the junction. Changes will also be carried out at the existing junction 29 roundabout.
Two one-way link roads will be provided north and south of the A2, connecting to the existing A289 and the old A2 at the eastern end. Neither of these link roads will connect to the A2 at M2 junction 1, with these connections being made at the site of the new LTC junction instead.
The A2 will be kept at its existing height and the link roads will be at approximately the same height.
We will need to rebuild a section of the M2/A2 immediately to the west of the new junction and for approximately 2 miles (3.5km) to the east, including junction 1 of the M2.
The route will pass under Thong Lane and approach a new junction with the A2, situated at the eastern edge of Gravesend. The road will be in a cutting approaching the tunnel.
The following images show the proposals for the section of the route south of the river in Kent.
Map Book 2 – Land Use Plans – view here
Map Book 3 – Engineering Plans – view here
Map – General Arrangement – A1 – view here
Map – Large Scale General Arrangements – 1/10,000 scale – view here
Map – Land Use Plan – for land and property – view here
Map – Land Use Plan – book of six – view here