M25 junction 3
Strengthening the east and west bridges over the M20 at the Swanley interchange in Kent.
The Swanley interchange connects the M25 with the M20 and provides a vital link between the Kent ports, London and the south east.
It also connects the country to local attractions such as Brands Hatch and the Kent Downs.
We’re strengthening the two bridges which carry the road over the M20 by replacing the existing steel plates with corrosion resistant carbon-fibre rods to keep the structure safe and secure.
These bridges over the M20 were originally built with bonded steel plates in the 1970s. Additional repairs were made in the 1990s.
Work is now needed to reinforce these structures so they can withstand predicted future traffic loads and keep the bridges safe.
Work on the east bridge is due to take place between July and November 2023.
We’re planning to carry out the same work on the west bridge in summer 2024.
Carrying out this reinforcement work will:
- improve safety and increase the life span of the bridge
- reduce the likelihood of disruption caused by emergency repairs
- strengthen the road surface from vehicles carrying heavier loads
- reinforce the structures so they’re able to carry predicted future traffic loads
- reduce the risk of weight restrictions being imposed at the junction in the future