Harwell Campus Entrance (A4185 Newbury Road / Thomson Avenue) Improvements

The Proposed Scheme

Oxfordshire County Council has been successful in obtaining City Deal funding from the Department for Transport for a number of schemes in the Science Vale area. One of these is to improve access to the Harwell Campus which is a strategically important part of the Science Vale UK Enterprise Zone. The site is subject to continuing, ambitious development and the access improvements are required to complement these developments.

Proposal SV 2.9 within Connecting Oxfordshire: Local Transport Plan 2015-2031 aims to improve the Harwell Campus access points to accommodate its forecast growth by 2031 in complement to the recently improved A34 Chilton Interchange.

The current give-way junction between the A4185 Newbury Road and Thomson Avenue will be insufficient to cater for the additional predicted trips into and out of the site. Initially, a three-arm roundabout was proposed as a means to improve the junction and a public consultation was undertaken (see here for details). Subsequent design work established that the construction costs of a roundabout would have been prohibitive due to significant utility diversions and third-party land acquisition.

It is now proposed that this junction off Thomson Avenue will be upgraded through the provision of new traffic signals (see scheme plan in documents section below). This new design will provide greater capacity to accommodate the predicted future housing and employment growth in the Science Vale area and is the most cost-effective option.

These proposals include the following key features:

  • Improved central refuge crossing areas, including a new staggered pedestrian and cycle crossing over Thomson Avenue;
  • Advanced stop lines for cyclists on each arm of the junction;
  • A right turn lane into Thomson Avenue to help the flow of traffic southbound along Newbury Road;
  • The existing bus stop lay-by for northbound services will be removed and the bus stop relocated further north, positioned in the traffic lane rather than in a lay-by.

Your Comments

Your feedback will provide helpful information that can be fed into the subsequent design stages. Please review the consultation documents below before emailing your response to:


Your views are appreciated, thank you very much for taking the time to respond.

Next Steps

The scheme is currently at the preliminary design stage; comments on all aspects of the scheme will be considered and fed into the detailed design of the scheme. Construction is anticipated in late 2018/early 2019.

Feedback will be made available once the consultation responses have been analysed.

Updates will be posted on: https://www.oxfordshire.gov.uk/cms/content/harwell-campus-entrance

This consultation has now closed and feedback is available.


  • Opened
    2 Mar 2018 at 00:00
  • Closed
    6 Apr 2018 at 23:59
  • Response Published
    04 May 2018

Summary of Results

  • Thomson Avenue Consultation Response Report
    This report summarises the comments during the consultation into the topic areas and provides a response from the County Council. Full comments as submitted can be found in the appendix.



Contact Name Will Pedley
Contact Email Address will.pedley@oxfordshire.gov.uk
Contact Phone Number 07766 780558

Consultation Topic
  • Roads & transport
Geographical Area
  • Didcot