Drivers in and around North Somerset will have five 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 30 minutes. Another will cause moderate delays of between 10 minutes and half an hour.

The latest expected works list, with notes from National Highways, shows that five closures are due to start over the next two weeks:

• M5, from 8pm April 8 to 6am April 12, slight delays (under 10 minutes): M5 northbound, junction 20 to 19, lane closure for surveys.

• M5, from 8pm April 11 to 4am April 12, slight delays (under 10 minutes): M5 both directions, junction 20 to 21 lane closures for safety barrier repairs.

• A4, from 8pm April 12 to 6am April 16, moderate delays (10-30 minutes): M5 northbound, junction 19 exit slip closed for surveys, diversion via, junction 18, St. Brendans roundabout and back.

• A4, from 9pm April 15 to 6am April 16, severe delays (more than 30 minutes): M5 northbound, junction 21 to 18 - carriageway closure for electrical works, diversion from, junction 21 via A370, A4 Portway to re-join M5 at, junction 18, diversion from, junction 20 via M5 southbound, exit jct 21 and follow diversion, diversion from, junction 19 via A369, A4 to join M5 at, junction 18.

• M5, from 9pm April 18 to 6am April 24, slight delays (under 10 minutes): M5 southbound, junction 19 to 20, lane closure for surveys.

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