A21 Tonbridge to Pembury dualling

We created a new dual carriageway and flyover to speed up journeys, improve safety and boost the local economy – benefitting over 35,000 drivers a day

We delivered a series of vital upgrade works to the A21 between Tonbridge and Pembury in Kent. The project included widening the road into a dual carriageway, adding two new junctions and creating a flyover to reduce congestion and ensure smooth journeys for road users.

This challenging project was located in an Area of Natural Outstanding Beauty with significant cultural heritage. We used state-of-the-art technology and extensive expertise to ensure safe, environmentally sensitive project delivery.

For example, we used innovative Microsoft Hololens technology to support the design of a new footbridge on the scheme. The mixed-reality headset and visor enables users to visualise an asset before it has been built, providing the opportunity to foresee any challenges which might arise. 


Increasing biodiversity on site

The road improvements were carried out to the highest environmental standards to protect the beautiful, protected countryside alongside the road.

Rather than removing ancient woodland and the seed-rich topsoil from the site, our expert teams gently moved the trees and soil to a nearby area using the latest techniques. The hope is that the area’s ecological make up will be preserved.

New areas of heathland are being created in addition to 6 metres of high temporary fencing to help guide bats travelling over the new road while new planting becomes established. We also installed 900 metres of noise barrier environmental fencing and four wildlife ponds during the project. An ancient barn has been carefully taken down and is now being reconstructed and preserved at a heritage museum.


drivers a day


opportunities for the next generation

9 hectares

translocated woodland

Throughout the duration of the project, the scheme created 11 graduate placements, five apprenticeships and six work experience placements. The Balfour Beatty site team has also helped over 200 school children to understand road safety by providing talks to local schools surrounding the project.