Drivers in and around South Somerset will have National Highways road closures to watch out for this week.

And one of them is expected to cause severe delays – with motorists facing a holdup of at least half an hour.

The roads include the M5, A303, A30 and subsidiary roads.

The latest expected works list, with notes from National Highways, shows that five closures already in place are expected to carry on this week:

• A303, from midnight, January 29 to 6am November 2, slight delays (under 10 minutes): A303 eastbound, Sparkford lane closure/contraflow for Sparkford to Ilchester improvement scheme.

• A303, from 6am September 28 to 6am November 9, slight delays (under 10 minutes): A303 both directions Podimore to Sparkford lane closures for Sparkford to Ilchester improvement scheme.

• A303, from 8pm December 8 2021 to 6am November 9 2024, slight delays (under 10 minutes): A303 both directions 50mph speed limit for Sparkford to Ilchester improvement scheme.

And a further eight closures will begin over the next two weeks:

• A303, from 8pm November 6 to 6am November 7, slight delays (under 10 minutes): A303 westbound, Tinkers Hill to Wincanton, carriageway closure for White lining/Road markings, diversion via B3081 and rejoin A303.

• A303, from 8pm November 7 to 6am November 8, slight delays (under 10 minutes): A303 eastbound, Wincanton to Tinkers Hill, carriageway closure for White lining/Road markings, diversion via B3081 and rejoin A303.

• A303, from 8pm November 8 to 6am November 15, slight delays (under 10 minutes): A303 westbound, Wincanton to Sparkford, carriageway closure for White lining/Road markings, diversion via A371, A359 and rejoin A303.

• A303, from 9.30am to 3.30pm on November 10, slight delays (under 10 minutes): A303 westbound, Tintinhull to Cartgate lane closure for BT works.

National Highways is responsible for maintaining motorways and major A-roads, so closures of smaller roads will not be included in their schedule.

• M5, from 8pm November 11 to 6am November 12, slight delays (under 10 minutes): M5 both directions, junction 23 to 22, lane closure for structure inspection.

A30, from 8pm January 2 to 5am December 28, slight delays (under 10 minutes): M5 both directions, junction 20 to 31 mobile lane closures for drainage works.

• M5, from 8pm October 30 to 6am November 1, moderate delays (10-30 minutes): M5 northbound, junction 26 to junction 25 carriageway closure for resurfacing, diversion via A38, A358 Toneway to junction 25.