A section of the A1(M) in Hertfordshire is set to close overnight this week, with essential work being carried out on a "significant safety defect".

Northbound carriageway will be fully closed overnight between Junctions 6 for Welwyn and 7 for Stevenage, from 9pm and 6am, to allow the work to be carried out.

Lane one will also remain closed throughout the week.

Drivers should allow extra time for their journeys and follows the official diversion route signed.

National Highways confirmed the closure will allow them to "determine the full extent of the significant safety defect and to ensure the safety of all road users".

"We are sorry for any inconvenience caused," said Heather Openshaw, head of service delivery at National Highways.

"The team is working around the clock to determine the full extent of the defect and confirm the remedial works that are required.  

"Our roads keep the country moving, keep families connected and businesses in business, so our roadworkers are vital to everyone’s wellbeing, and their wellbeing is vital to us."

National Highways also said it "recognises challenges posed by the defect, and condemns the unfair frustration expressed by drivers towards roadworkers".

This follows urgent repair works last week.