The work at junction 15 of the M4 means there will be closures overnight throughout the rest of July and most of August.

But restrictions will be removed for the August Bank Holiday weekend of 28-30.

Until August 10 the east side of the J15 roundabout will be closed and there will be no access onto the roundabout from the A419 southbound. The M4 westbound exit-slip and M4 eastbound entry-slip will also be closed.

The closure will be in force between 8pm and 6am every night.

Between August 11 to September 7, apart from the bank holiday weekend , the west side of the roundabout will be closed and there will be no access from the A346 northbound, or off the roundabout to the A419 northbound.

The M4 eastbound exit-slip and M4 westbound entry-slip will also be closed.

Locally signed diversions will be in place and all drivers are encouraged to stick to the officially signed route.

Work involves widening of the southbound carriageway between Commonhead roundabout and junction 15, providing a dedicated left lane for London-bound traffic and improving the A346/Marlborough Road entry and widening of the M4 Junction 15 eastbound exit-slip.