South Gloucestershire road closures: more than a dozen for motorists to avoid this week

South Gloucestershire's motorists will have 15 road closures to avoid nearby on the National Highways network this week.

And four of them are expected to cause delays of between 10 minutes and half an hour.

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

• M48, from 9pm April 3 to 6am July 5, slight delays (under 10 minutes): M48 both directions mobile lane closure for drainage works.

• M4, from 5am March 17 to 9pm September 15, slight delays (under 10 minutes): M4 westbound, junction 19 to 20 - narrow lanes including 24/7 closure of offside running lane for SMART motorway improvements.

• M4, from 5am March 11 to 9pm September 15, slight delays (under 10 minutes): M4 eastbound, junction 20 to 19 - narrow lanes including 24/7 closure of offside running lane for SMART motorway improvements.

• M5, from 5am March 25 to 9pm September 15, slight delays (under 10 minutes): M5 northbound, junction 17 to 16 - narrow lanes for SMART motorway improvements.

• M32, from midnight, March 26 to 5am November 19, slight delays (under 10 minutes): M32, junction 1 to M4, junction 19 and M4, junction 19 to 23 used by GWR Railway Replacement Buses for Bristol Parkway to Newport route.

And a further 10 closures will begin over the next seven days:

• M4, from 9am to 3pm on April 24, slight delays (under 10 minutes): M4 both directions, junction 21 to 23 hard shoulder closure for structure maintenance.

• M4, from 9pm April 24 to 5.59am April 25, moderate delays (10-30 minutes): M5 northbound, junction 18, junction 18A exit and entry slip closed for road markings renewal. Diversion for both exit slips via M5, junction 17 and back. Diversion for entry slip at, junction 18A via M49 north and M4.

• M48, from 9pm April 25 to 6am April 27, slight delays (under 10 minutes): M48 both directions mobile lane closure for barrier works.

• M4, from 9pm April 26 to 6am April 27, moderate delays (10-30 minutes): M4 eastbound, junction 20 to 19 - lane closures for SMART motorway improvements.

• M4, from 9pm May 2 to 6am May 26, moderate delays (10-30 minutes): M4 westbound, junction 22 closed between exit and entry slip road for carriageway repairs. Diversion via exit and entry slip roads.

• M4, from 9pm May 2 to 6am May 3, slight delays (under 10 minutes): M5 northbound, junction 18 entry slip road closure for survey works, diversion via M49, M4, M5.

• M5, from 10pm May 2 to 6am May 3, slight delays (under 10 minutes): M5 southbound, junction 14 to 15 lane closure for electrical works.

• M4, from 9pm May 3 to 6am May 4, slight delays (under 10 minutes): M4 westbound, junction 18 to 19 lane closure closure for electrical works.

• M4, from 9pm May 4 to 6am May 26, moderate delays (10-30 minutes): M4 eastbound, junction 22 closed between exit and entry slip road for carriageway repairs. Diversion via exit and entry slip roads.

• M4, from 11.59pm May 4 to 6am May 20, slight delays (under 10 minutes): M4 westbound, junction 22, 50 mph speed restrictions.

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