The Forest of Dean's motorists will have 12 road closures to avoid nearby on the National Highways network this week.

And four of them are expected to cause moderate delays – with drivers facing holdups of between 10 minutes and half an hour.

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

• M4, from 10pm June 11 to 10am June 19, moderate delays (10-30 minutes): M4 eastbound, Prince of Wales Bridge carriageway closed overnight for bridge maintenance. Diversion via M48 Severn Bridge.

• M50, from 9.30am June 6 to 4.30pm June 30, slight delays (under 10 minutes): M50 northbound and southbound, junction 2 to junction 4, hard shoulder closure for litter clearance.

• M50, from 9am May 24 to 6am July 5, moderate delays (10-30 minutes): M50 eastbound, junction 4 to junction 3, Lane closure and carriageway closures for barriers repairs.

• A40, from 11am March 3 2021 to 8pm August 9 2022, slight delays (under 10 minutes): A40 Dursley Cross temporary two-way traffic lights for emergency landslide works.

• M48, from 7pm May 9 2022 to 6am April 5 2023, slight delays (under 10 minutes): M48 eastbound, junction 2 to 1 Severn Bridge - carriageway closure for structure maintenance, diversion via M4 Prince of Wales Bridge.

• M48, from 7pm May 11 2022 to 6am April 7 2023, slight delays (under 10 minutes): M48 westbound, junction 1 to 2 Severn Bridge - carriageway closure for structure maintenance, diversion via M4 Prince of Wales bridge.

• M4, from 10pm May 23 2022 to 6am April 14 2023, slight delays (under 10 minutes): M4 westbound, junction 22 to 23 Prince of Wales Bridge - carriageway closure for structure maintenance, diversion via M48 Severn Bridge.

And a further five closures will begin over the next seven days:

• M4, from 7pm June 13 to 6am June 15, slight delays (under 10 minutes): A40 Monmouth to Ross-on-Wye, M50, M5, junction 8 to 15 and M4, junction 20 to 23 used as a diversion route (for abnormal loads only) due to South Wales Trunk Road Agent contraflow on the A40 Gibraltar Tunnel.

• M5, from 8pm June 13 to 6am June 16, slight delays (under 10 minutes): M5 southbound, junction 13 - 14 lane closures for footbridge works.

• A449, from 9pm June 13 to 6am June 18, moderate delays (10-30 minutes): M50 eastbound and westbound, junction 2 to junction 4, Lane, carrriageway and associated slip road closures for inspection/survey.

• M48, from 7pm June 17 to 6am June 20, moderate delays (10-30 minutes): M48 westbound, Severn Bridge carriageway closed 24 / seven for main cable inspection and other maintenance works. Diversion via M4 Prince of Wales Bridge.

• M48, from 7pm June 22 2022 to 6am January 23 2023, slight delays (under 10 minutes): M48 westbound, Severn Bridge - Lane closure for main cable inspection works.

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