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    National Highways’ £50M M5 bridge repairs: staging and durability notes for engineers

    May 26, 2026|

    Reviewed by Tom Sullivan

    National Highways’ £50M M5 bridge repairs: staging and durability notes for engineers

    First reported on New Civil Engineer

    30 Second Briefing

    National Highways will spend more than £50M on the next phase of “essential” and “extensive” structural repairs to a major M5 road bridge in North Somerset, targeting long-term durability on this key strategic route. Works are expected to focus on concrete repair, waterproofing, bearing replacement and joint renewal to address ageing elements under high traffic and de-icing salt exposure. Contractors will need to manage complex staging and traffic management on a live motorway, with implications for night-time possessions, lane closures and construction sequencing.

    Technical Brief

    • Investment exceeds £50M, indicating a major multi-year structural intervention rather than routine maintenance.
    • Bridge sits on the M5 strategic corridor in North Somerset, constraining diversion and closure options.
    • Extensive structural repairs of this scale typically trigger updated inspection, monitoring and access regimes for similar assets.

    Our Take

    National Highways features heavily in our infrastructure coverage, and the mix of this £50M M5 repair with the recent £20M A21 upgrade criticism suggests its asset management strategy is under closer public and political scrutiny on how spend translates into measurable safety outcomes.

    The High Court breach of contract claim against WSP over the net-zero roadmap, alongside this major bridge repair in North Somerset, signals that National Highways is juggling both legacy asset integrity and decarbonisation planning risks at the same time, which may complicate long-term programming of renewals.

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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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