A47 Thickthorn Junction and RIS3: design and funding takeaways for engineers
Reviewed by Joe Ashwell
First reported on New Civil Engineer
30 Second Briefing
Work is ramping up on National Highways’ A47 Thickthorn Junction upgrade near Norwich as roads minister Guy Opperman visits site and talks up the forthcoming Roads Investment Strategy 3 (RIS3). The scheme is replacing the existing roundabout with a free‑flowing grade‑separated junction to cut congestion on the A47/A11 interchange, a key strategic link to Great Yarmouth and the Midlands. Opperman signalled that RIS3 will prioritise similar major junction upgrades and corridor improvements on the Strategic Road Network, with detailed funding envelopes expected in the next spending period.
Technical Brief
- Grade separation at Thickthorn will require substantial earthworks, retaining structures and drainage reconfiguration around the junction.
- Free‑flow slip roads will demand high‑speed geometric design, including superelevation and widened radii for HGVs.
- Interface with existing local access roads and development plots will drive tie‑in geometry and service diversions.
- Junction works will likely trigger updates to noise barriers, lighting columns and highway drainage outfalls.
- RIS3 emphasis on major junctions suggests repeatable design templates for grade‑separated interchanges on similar corridors.
Our Take
Among the 708 Infrastructure stories in our database, only a small subset deal with UK strategic road programmes, so the A47 Thickthorn Junction upgrade gives one of the clearer early signals of how RIS3 may translate into on-the-ground junction and corridor schemes.
For UK practitioners, Thickthorn’s progression under the Roads Investment Strategy 3 framework is likely to act as a reference case for how DfT and National Highways handle design development, statutory processes and phasing on other RIS3 junction upgrades.
Because this is tagged as a Projects piece rather than policy-only coverage, it suggests RIS3 is now moving from planning rhetoric to delivery, which will matter for contractors and consultants positioning for future UK junction and corridor tenders.
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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