Wiltshire Council has opened bidding for a motorway pinch point fix.
The project, set to start construction in 2027, will fully signalise, widen, and upgrade the junction to handle future traffic growth along the A350 corridor.
Funding is secured through the Government's Major Road Network programme.
Works will "maximise and optimise capacity of the junction within the bounds of the existing highway" and avoid piecemeal upgrades.
Author's summary: Bidding starts for M4 upgrade.