M27 junction 12 Hilsea Interchange IBM bridge repairs

Latest updates

• 15 May 2025

  Essential work starts soon

  Essential repairs start soon on two bridges near the M27 Junction 12 Hilsea Interchange in Hampshire.

  Known locally as the IBM bridges, one carries the M27 carriageway eastbound and the other westbound, near the Portbridge Roundabout.

  The work will include replacing both bridges’ expansion joints: these allow for the expansion / contraction of bridge decks, caused by temperature variations and traffic movement. 

  We'll also:

  • replace kerb drainage and upgrade the drainage systems
  • re-waterproof and resurface the bridge decks
  • repair concrete underneath both bridges 

  For safety, there will be a lane one closure in both directions from 8pm Thursday night through to 6am Monday morning on both bridges throughout June, starting Thursday 5 June. This will then change to lane three throughout July and early August. 

  We'll also need some overnight, full carriageway closures in August. We'll do this in one direction at a time to limit disruption to traffic as much as possible. 

  In September to the end of November, we'll need some full weekend closures. We'll do this in one direction at a time to limit disruption to traffic as much as possible. We'll update this web page with full dates/details once they're confirmed.