National Highways is carrying out refurbishment works at the M4/M5 Almondsbury Interchange this winter, with several major closures planned between October 2026 and February 2027.
Drivers travelling through the area are advised to plan ahead and allow extra time for their journeys.
Upcoming closures
11 October – December 2026
M4 J20 westbound → M5 J15 northbound
Closed 24/7
Diversion: via M5 J16 southbound
Expected additional off-peak journey time: around 4 minutes
M5 J16 and M4 J22 are expected to be busier than usual.
30 October, 8pm – 2 November, 6am
M5 J14
Full weekend closure, including entry and exit slip roads and the B4509
Diversion: via the A38
Emergency vehicle access will be maintained.
December 2026 – February 2027
M4 J20 eastbound → M5 J16 southbound
Closed 24/7
Diversion: via M5 J14
Expected additional off-peak journey time: around 15 minutes
M4 J19 and M32 J1 are expected to be busier than usual.
Please plan ahead
National Highways advises drivers to:
Allow extra time for journeys and expect delays.
Check alternative routes in advance, as other roadworks are planned in the area.
Consider avoiding the interchange at peak times or using alternative transport for longer journeys where possible.
Closures can change at short notice.
For the latest updates, diversion maps and daily closure information, visit the National Highways website:
https://nationalhighways.co.uk/roads-and-travel/road-projects/south-west/m4-and-m5-almondsbury-interchange/