Octavius £112m Walsgrave junction upgrade: design and phasing notes for engineers
Reviewed by Joe Ashwell
First reported on The Construction Index
30 Second Briefing
Planning consent via a development consent order has been granted for the A46 Walsgrave junction upgrade on Coventry’s outskirts, a scheme previously costed at £112m and classed as a nationally significant infrastructure project on the Trans-Midlands Trade Corridor between the M5 and Humber ports. The project will replace the existing three-arm priority roundabout linking the A46 and B4082 with a free-flowing A46 mainline while maintaining local access, targeting reduced delays for around 57,000 daily users. National Highways and main contractor Octavius Infrastructure will now finalise design and updated costs, with construction due to start in autumn 2026 and opening in 2028.
Technical Brief
- Development Consent Order under the Planning Act 2008 classifies the junction as a Nationally Significant Infrastructure Project.
- Existing junction form is a three-arm priority roundabout connecting the A46 trunk road with the B4082.
- Upgrade design introduces a free-flow mainline A46 with separate local access movements retained.
- National Highways is client; Octavius Infrastructure appointed as main contractor for detailed design and delivery.
- Previous capex estimate of £112m is now being rebaselined, implying cost risk from inflation and scope refinement.
- Scheme sits on the Trans‑Midlands Trade Corridor between the M5 and Humber Ports, prioritising freight reliability.
- Daily demand of around 57,000 vehicles drives capacity, queuing and safety performance requirements for the new layout.
Our Take
Within our 636-item Infrastructure corpus, there are relatively few pieces focused on Coventry and the midlands road network, so the A46 Walsgrave junction upgrade stands out as one of the more substantial regional highway schemes scheduled into the late-2020s pipeline.
The 2021 and 2025 ownership changes for Octavius Infrastructure, culminating in acquisition by the RSK consultancy group, suggest this £112m-class highways job will be delivered under a more integrated contractor–consultant model than many legacy National Highways schemes in our database.
With construction not expected to start until autumn 2026 and opening targeted for 2028, the A46 scheme will overlap with other midlands and southwest corridor works in our coverage, which is likely to tighten demand for specialist traffic management, ground investigation and structures resource along the Trans-Midlands Trade Corridor.
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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