Didcot and surrounding area infrastructure improvements

Reducing congestion and improving journey times, pedestrian and cycling connectivity and supporting new employment sites and housing.

Traffic Management notice

As part of our ongoing enabling works, we will need to put in place traffic management measures to safely undertake site clearance and ground investigations.

Milton Road near the junction to Hachette UK - 16-28 February 2026

An additional trial hole investigation will be conducted in this location. The westbound lane will be closed and 3-way traffic lights will be in operation between the hours of 10am - 4pm.

A4130 Collet Roundabout - 23-28 February 2026

Overnight lane closure with 4-way traffic lights. These will be operational between 7pm and 6am.

Alongside the A4130, from Milton Interchange services to Sir Frank Williams Avenue and from Hawksworth roundabout to Collett roundabout 23 February – end March 2026

This activity will involve site-wide clearance of necessary vegetation, as preparation for the creation of the site compounds for the Didcot Science Bridge section.

Work directly adjacent to the existing highway along the A4130 will require 2-way traffic lights between 7pm - 6am, Monday to Friday.

Please note that some of the equipment and machinery used during these works can be noisy, and while some disturbance is unavoidable, we will do everything possible to minimise the impact. The work will be phased to prioritise activity close to residential areas early in the shift, and the noisiest operations will cease before 11pm.

About the improvements

The Didcot and surrounding areas major infrastructure scheme will provide vital transport infrastructure to reduce congestion and enable more reliable journey times, improve pedestrian and cycling connectivity, and support new employment sites and housing in and around Didcot.

The project includes four highway sections that incorporate improvements to existing roads, the construction of new roads, new walking and cycle routes, and will help to facilitate new and enhanced bus services.

Key benefits:

19km of walking and cycling paths to improve pedestrian and cycle connectivity for work and leisure trips
18 new bus stops to provide more sustainable travel options in and around Didcot
Reduce congestion and improve air quality in surrounding villages and parishes
Enable more jobs in the local area in new and existing employment sites
Support expected housing growth in the local area

Compulsory purchase orders (CPOs) and side road orders (SROs)

The Side road order (SRO) and compulsory purchase order (CPO) for the Didcot and surrounding area infrastructure improvements has been confirmed by the Secretary of State for Transport.

Scheme benefits

Overview (pdf format, 564Kb)

Your questions answered

Frequently asked questions.

Take a look at a flyover of the scheme

Note: This video has only music audio.

What is happening when?

Enabling works

Enabling works have started on the Clifton Hampden Bypass and Didcot to Culham River Crossing sections.

The enabling works scheduled for completion between Autumn 2025 and Spring 2026 include:

Erection of temporary fencing, including tree protection measures
Archaeological investigations
Site clearance to facilitate archaeological activities
Set up of main compounds, site offices, and welfare facilities
Utility diversions

Enabling works for the Didcot Science Bridge will begin on 2 March 2026.

There will be site compounds at three locations: behind the Milton Interchange services, off Milton Road on the old power station land, and off Sir Frank Williams Avenue (near the northern entrance to Great Western Park).

Work being undertaken will include:

Site-wide installation of perimeter fencing
Installation of site haul roads
Installation of car parking
Set up of site lighting and CCTV
Building of site welfare and office units
Installation of site signage, including wayfinder signage on public highways
Utility connections for the main compound at Milton Interchange services

How it is being funded

Funding for the scheme comes from a combination of Homes England grant funding, Enterprise Oxfordshire capital investment, Section 106 contributions from developers and funds from the council's own capital budget.

Contact us

If you have any queries, please contact the delivery team.

Project Newsletter

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Find out more about each element

Element 1: Widening of the A4130

The creation of a dual carriageway east of Milton Interchange with 1.6km of high quality and segregated walking and cycling facilities, linking to the future development at Valley Park and Didcot Science Bridge. Learn more about widening the A4130.

Element 2: Didcot Science Bridge

A new single-carriageway road bridge over the A4130, Great Western Main Line, and Milton Road, connecting to a new link road through the former Didcot A Power Station. The element connects with the Northern Perimeter north of Purchas Road roundabout. High-quality and segregated cycling and pedestrian facilities will be provided along the length of the scheme. Learn more about the Didcot Science Bridge.

Element 3: Didcot to Culham river crossing

A new single carriageway link road between the A4130 at Didcot and the A415 at Culham, with high quality and segregated walking and cycling facilities. It will include a new bridge over the Appleford Railway sidings and a new bridge over the River Thames. Learn more about the Didcot to Culham river crossing.

Element 4: Clifton Hampden bypass

A new single-carriageway link road between the A415 at Culham and the B4015 to the north of Clifton Hampden, with shared-use walking and cycling facilities. Learn more about the Clifton Hampden bypass.