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    Graham wins Didcot Clifton Hampden Bypass: design and traffic notes for engineers

    April 22, 2026|

    Reviewed by Joe Ashwell

    Graham wins Didcot Clifton Hampden Bypass: design and traffic notes for engineers

    First reported on The Construction Index

    30 Second Briefing

    Graham has been appointed by Oxfordshire County Council to build the Clifton Hampden Bypass, the second of three contracts in the Didcot and surrounding areas major infrastructure scheme. The project delivers a new single carriageway between the A415 at Culham Science Centre and the B4015 Oxford Road, with segregated shared walking and cycling facilities and a new roundabout giving access to Culham Science Centre and Culham railway station. Additional new junctions on the eastern side and at the north-eastern tie-in to the existing A415 will re-route A415 through-traffic away from Clifton Hampden village and its primary school.

    Technical Brief

    • Contract is the second of three packages in Oxfordshire County Council’s Didcot area infrastructure programme.
    • Graham’s scope centres on re-routing A415 through-traffic away from Clifton Hampden’s constrained village corridor.
    • Direct access provision to Culham Science Centre and Culham railway station introduces multi-stakeholder phasing constraints.

    Our Take

    Oxfordshire County Council’s selection of Graham for the Clifton Hampden Bypass sits alongside its separate £350m HIF1 phases with VolkerFitzpatrick, signalling that the council is deliberately spreading major road packages across multiple tier‑one contractors to manage delivery and risk.

    In our database, Graham’s recent wins on the Hereford Bypass and other UK road schemes suggest the Didcot-area work will benefit from a contractor that is currently building a strong portfolio in complex regional bypass and highway realignments.

    Graham’s parallel appointments to major frameworks such as Sovereign Network Group’s housing programme and the Procure Partnerships North West infrastructure lots indicate it will be balancing the Clifton Hampden Bypass against a broad UK public-sector workload, which may influence resourcing and phasing around Culham Science Centre and Culham railway station.

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    Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.

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