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A30 Runnymede roundabout Egham, improvement scheme

Latest updates

Sunday 12 November - During November the construction of the U-turn facility will start. This means that from 12 November traffic travelling from Windsor towards Egham will be diverted via Woodhaw roundabout in line with the final road layout.

Work continues on the drainage system, carriageway construction and utility service diversions.

Monday 2 October 2017 for 16 weeks - the dedicated slip lane from A308 Windsor Road heading to M25 (via A30) will be closed from 9:30am on Monday 2 October 2017 for 16 weeks. The lane closure will be in place at all times to facilitate the construction of the new road layout including the installation of the new surface water drainage system. Access to the M25 (via A30) will still be available from A308 Windsor Road using the other carriageway lanes which will remain open.

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Scheme overview

The Runnymede Roundabout scheme involves making improvements to the layout on all approaches to the roundabout and to the roundabout itself. This project is one of the Runnymede Major Transport Schemes.

The scheme will involve:

  • The creation of new and the widening of existing carriageway lanes around the junction
  • The creation of a new ‘U-turn’ facility for traffic heading towards Staines upon Thames from the M25 which will allow vehicles to avoid negotiating the main part of the junction
  • The provision of a dedicated left turn onto the B388 from the M25/Staines
  • The installation of traffic lights throughout the junction to control the traffic 24 hours a day
  • The provision of controlled crossing facilities for pedestrians and cyclists
  • Improvements to the drainage infrastructure
  • Resurfacing the entire carriageway
  • Installation of new road signs, fences and safety barriers and footways, including a brand new facility to the north linking the A308 Windsor Road to the A308 The Causeway.

The main benefits of these works include:

  • Cutting congestion and increasing the capacity of the junction
  • Reduced conflict between vehicles negotiating the junction
  • Approximately 800 vehicles taken away from the main part of the junction during peak times through the use of the new ‘U-turn’ facility
  • Improved road safety for all road users
  • Helping to reduce the likelihood of surface water flooding
  • Helping to deliver economic prosperity in Surrey.

The plans detailing the new road layout can be viewed on the PDF at the bottom of this page.

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Schedule of works

Monday 10 July until approximately March 2018 - main construction works will commence with lane closures and a temporary road restraint system on the roundabout. These works are scheduled for completion in early March 2018, subject to weather and operational conditions.

The current lane closures will need to remain in place once works begin because the excavation extends into the road. This is to protect all road users and workforce from the on-going works. Please be assured that the lane closures are the minimum possible and are required to meet good traffic management practices. These are set by The Department of Transport to protect the workforce and we regret that these are an unavoidable part of this scheme.

July to October 2017 - various utility companies will be carrying out diversion works to their pipes, cables and ducts during the first stages of the scheme between July and October 2017. These works will be coordinated daily to minimise the impact on traffic flow. This will require adjustments to the existing traffic management, we will continually update this web page with these changes.


Keep up-to-date

We will be issuing regular updates on this web page as the scheme progresses. Enter your email address below to keep up to date with the Runnymede Roundabout improvement works.

View our October newsletter


Frequently asked questions

How can I access the A30 (Egham By-pass) or the B388 (The Avenue) from the A308 (Windsor Road)?

Due to the new ‘u-turn’ facility, traffic approaching from the A308 Windsor Road or the A30 Egham By-Pass that wishes to access The Avenue will now need use the The Glanty/Woodhaw roundabout if they wish to return westbound. Traffic surveys of Runnymede Roundabout have shown that these manoeuvres currently account for only 1% - 2% of vehicles during peak times.

Alternative routes also currently exist for vehicles travelling in the following directions:

· The A30 Egham By-Pass runs parallel to The Avenue, thereby bypassing Egham Town Centre. Therefore, eastbound traffic heading to Egham Town Centre could approach using High Street via the Egham Hill Roundabout, rather than using the A30 Egham By-Pass and then returning west using The Avenue.
· Vehicles currently using the A308 Windsor Road to head south or towards Egham Town Centre may be better served by using the A328.

Why are you adding this loop and changing the roundabout to a gyratory system?

The aim of the scheme is to keep traffic flowing by converting the roundabout to a gyratory system. This will increase capacity and cause less congestion as well as making it easier for pedestrians and cyclists to safely navigate the roundabout.

Traffic surveys have shown that the current layout of the roundabout is stopping traffic leaving the M25 and causing it to become congested. By creating this small loop it will carry a significant proportion of traffic that exits the M25 to travel towards Staines. There will also be a dedicated left turn for traffic coming from the M25 going towards Egham.

What are you doing to improve merging traffic from the M25 and Staines?

We recognise that Runnymede Roundabout can currently be difficult for road users to join and navigate given the flows of traffic from certain approaches. This issue and the impact it can have on road safety and congestion was a significant reason behind the project.

The improvement works will include the installation of traffic signals on a number of the approach arms, including the A30 Glanty Loop (carrying M25 off slip traffic) and the A308 The Causeway. This will eliminate the conflict between traffic approaching the roundabout from The Causeway and the Glanty Loop which should make it significantly easier for road users to adopt the necessary lane before taking their desired exit.

Detailed drawings are available on the Runnymede Major Schemes web page which include the location of the proposed signals.

Was there a public consultation?

Yes there was a public consultation regarding the Runnymede roundabout scheme which ran from October to December 2013. The consultation included public exhibitions in Egham Library and the Runnymede Borough Council offices. Further information can be found on the Runnymede Local Committee web page and the results can be viewed on the consultation results document.

Will the new crossings cause congestion?

No as the new crossing points will have a short red light duration for vehicles to keep traffic flowing.

By signalising the approach junctions, vehicles will be able to join the roundabout in a managed way more easily as they will no longer conflict with circulating traffic. This should make using the roundabout itself a much more pleasant experience.

Why are you not building a flyover?

The proposed design gets the maximum benefits for residents from the funding available, improving conditions for both vehicle users and non-motorised users. Flyovers are very expensive to construct and would be unaffordable within the current project budget.

Why are you not working at night or at the weekend?

Night or weekend working significantly increases the overall cost of a project and is therefore also unaffordable within the current budget. However, the road resurfacing works and installation of the new road markings will be undertaken at night.

Files available to download

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