DIVERSION routes will be in place this weekend as the M27 will close between junction 3 and 4. 

The closure will allow Romsey Road Bridge to be replaced as part of a £19m scheme. 

The M27 will close between junction 3 (for Southampton City Centre) and junction 4 (for the M3) from 10pm on Friday night (28 June) and will reopen at 5am on Monday 1 July.

Fully signed diversion routes will be in place throughout the weekend, with separate routes for heavy vehicles.


  • Light vehicles will be diverted via M3 junction 11 down the A3090 through Romsey and down the A36 to M27 junction 2
  • Lorries will be diverted off at M27 junction 5, along the A27 to Chilworth roundabout, then along the A27 through North Baddesley, down the A3057, onto the M271 and re-joining the M27 at junction 3.


  • Light vehicles on the M27 originating from the A31 heading to London/M3 will be diverted off at M27 junction 2 to use the A36 and the A3090 through Romsey towards M3 junction 11
  • HGVs on the M27 coming from the A31 heading for M3/London will be diverted off the above route at Romsey. It will be directed onto the A27. These HGVs will then route through North Baddesley to Chilworth Roundabout, where they will pick up the A33 to join the M3 northbound. (This is to avoid the low bridges on the A3090.)
  • Traffic of any type on the M27 coming from the A31 and heading towards M27 east (e.g. from Bournemouth to Portsmouth) will be diverted off at M27 junction 3 to head up the M271 and A3057 northbound. Traffic will then be diverted, before it reaches Romsey, to join the eastbound A27, heading through North Baddesley and Chilworth Roundabout to re-join the M27 at junction 5.