A299 Thanet Way

From April to June 2023, we will be carrying out work on the A299 Thanet Way between Herne Bay and Whitstable.

This work will include the upgrade of the existing tunnel lighting system in the Chestfield Tunnel and deep reconstruction of the Thanet Way in various sections.

We will replace the lights and the lighting support system in the Chestfield Tunnel with Light Emitting Diode (LED) technology which is much more energy efficient and reduces our carbon emissions.

We will use the road closure as an opportunity to make permanent repairs to the surface of the A299. Changes in climate in recent years and prolonged periods of dry weather have caused the clay geology below the Thanet Way to shrink and cause movement to the surface of the road. We will undertake deep reconstruction repairs up to 1.6 metres to stabilise the sub-grade and clay.

For the safety of our workforce and highway users it will be necessary to close the A299 to undertake these works. We will be doing this in 2 phases (eastbound and westbound) to reduce the impact to the traffic flow.


8pm on Sunday 23rd April to 5am on Friday 26 May 2023.


1am on Tuesday 30 May to 5am on Friday 30 June 2023.

The A299 between Clapham Hill and Eddington junctions will be closed in only one direction at any time during these works.

There will be a signed diversion in place using the A2990 Thanet Way.

View a map of the works area, closure points and diversion routes (PDF, 4.7 MB).

If you need additional information, let us know via our online reporting tool by selecting 'Thanet Way Tunnel LED Upgrade'.