A423 Kennington improvements programme
We are improving the Kennington stretch of the A423, by replacing the existing bridge structure and prioritising space for cycling, walking and public transport. The programme will also complement the Oxford Flood Alleviation Scheme, to be delivered by the Environment Agency.
Update – 13 October 2025
Due to an increase in the estimated cost of replacing the rail bridge, we are working to secure central government funding. The full press release can be found at County council working to secure funding for Kennington rail bridge replacement.
About the improvements
The A423 Kennington improvement programme includes:
- the replacement of Kennington rail bridge
- improved facilities for cycling and walking
- a new eastbound bus lane – also for use by vehicles travelling to Redbridge park and ride
- increased capacity of the Hinksey streams for flood alleviation
- maintenance work on the Kennington road bridge
Figure 1. A layout picture showing where the work will take place on the A423
Why we are investing here
We are investing across the county to provide a modern, sustainable travel network that will enable people to rely less on their cars. This means putting better bus, cycling and walking infrastructure at the centre of our major projects.
Kennington rail bridge is regularly inspected and monitored but needs to be replaced. Reconstruction of the bridge will ensure safety for all users as well as the opportunity to prioritise road space for bus, walking and cycling.
Timescales
| Activity | Target date |
|---|---|
| Public engagement | September - October 2022 (complete) |
| Trial holes to plan diversion of water main | 24 January - 10 February 2023 (complete) |
| Planning application submitted | February 2023 (complete) |
| Planning Regulation 25 consultation | Advertised on 18 July, ended on 18 August 2024 (complete) |
| Bridge safeguarding inspection | August 2024 (complete) |
| Planning permission granted | 14 October 2024 (complete) |
| Trial holes and bridge inspection | 17-18 January 2025 (complete) |
| Safety inspection | January 2025 and August 2025 |
| Site surveys | Ongoing |
| Detailed design | Ongoing |
| Project review | Ongoing |
This may be subject to change, due to the complexities of the work involved.
What you can expect
Kennington rail bridge will remain open until we start building works.
We are also considering how to manage the impact on road users. Alternative routes will be provided and signed for pedestrians and cyclists throughout the work. Full details of how we will manage and divert traffic will be made available before we start work.
Phase 1 - Safeguarding work
The bridge has already been propped at its piers, and as part of phase one, its load-carrying capacity will be increased so that work can be carried out safely.
Phase 2 – Reconstruction
A423 Eastbound Lane
We are proposing to widen the A423 eastbound to introduce a lane for left-turning vehicles into Old Abingdon Road, a bus lane, and a footway/cycleway between Old Abingdon Road and Kennington roundabout.
The existing footway/cycleway on the southern bridge of the rail bridge will be retained.
Oxford Flood Alleviation Scheme (OFAS)
Combining the bridge replacement works with the Oxford Flood Alleviation Scheme (OFAS). Requirements will minimise disruption on the A423.
For more information on OFAS, visit the EA FAQ page on their scheme.
Planning application
Planning approval was granted in October 2024, following a digital exhibition and public engagement events held in 2022. A planning application was submitted in early 2023, there was a public comment period, and a further round of consultation on additional ground clearance requirements and updated documentation was held in summer 2024.
How it is being funded
The scheme is financed through multiple sources including the county council, Oxfordshire Local Enterprise Partnership and OFAS.
Contact us
If you would like to know more, you can contact us by emailing A423Kenningtonimprovements@oxfordshire.gov.uk