A1(M) closure LIVE: Major Hertfordshire road to remain closed throughout the night after 'serious collision'

The A1(M) is closed southbound on Saturday, December 27 after a serious collision and is expected to remain closed throughout the night as investigation and recovery work is conducted

The A1(M) southbound is closed between Junction 3 (St Albans/Hatfield) and Junction 1 (M25) following a serious collision.

Hertfordshire Police are leading the response and have said the closure is required to allow for detailed collision investigation work, vehicle recovery and safety checks.

"These processes are complex and time-consuming and require the carriageway to remain fully closed to ensure the safety of those working at the scene," National Highways said.

Details of the incident are still being established.

The closure is expected to remain in place throughout the night.

This is an ongoing event and updates will be provided.

02:26KEY EVENT

Normal traffic conditions expected between 5.45am and 6am

Normal traffic conditions are expected between 5.45am and 6am on Saturday, December 27, National Highways said.

All lanes remained closed as of 2.11am.

01:05Tannur Anders

Police say full investigation 'will not be needed'

"Police have advised a full investigation will not be needed so once the vehicles are recovered and the infrastructure damage is assessed the road will reopen," National Highways East said in a post on social media platform X, previously known as Twitter.

23:53Tannur Anders

All lanes closed southbound

National Highways said all lanes are closed southbound between Junction 2 and Junction 1.

23:50KEY EVENT

National Highways issues southbound diversion route

National Highways advised road users travelling southbound to follow the hollow circle diversion symbol on road signs:

• From the junction 3 exit slip road 'Roehyde Roundabout' take the 2nd exit on to the A414 'North Orbital Road' towards St Albans
• At the next roundabout take the 4th exit towards London Colney A1081
• At the next roundabout take the 2nd exit onto the M25 junction 22 towards junction 23 South Mimms for A1M

23:49Tannur Anders

What is known about the closure

National Highways has provided the following information regarding the road closure:

• The A1(M) southbound is closed between Junction 3 (St Albans/Hatfield) and Junction 1 (M25)
• The closure is due to a serious collision
• Hertfordshire Police are leading the response
• The closure is required to allow for detailed collision investigation work, vehicle recovery and safety checks
• Investigation work, vehicle recovery and safety checks are complex and time-consuming and require the carriageway to remain fully closed
• Details of the incident are still being established
• The closure is expected to remain in place throughout the night
• A diversion route has been issued