Is the A1M shut? Accident closes northbound carriageway in Hertfordshire near Welwyn

The A1M was shut at about midnight on the northbound side between Junction 4 for Welwyn Garden City and Junction 6 for Welwyn.

It’s estimated that the road may not reopen until about 10.30am.

A diversion route has been set up, following the solid diamond symbol. Drivers have been asked to

• Exit the A1(M) at Junction 4
• At the roundabout take the second exit towards Wheathampstead
• At the next roundabout take the first exit.
• Follow the B653 towards Wheathampstead.
• Turn left at the roundabout and take the fourth exit towards Welwyn at the next roundabout.
• Follow the B197 to the next roundabout and take the first exit towards Welwyn.
• Take the first exit towards Welwyn
• At the next roundabout go directly over following Welwyn (B656).
• At the next roundabout got directly over and rejoin the A1M.

Further information is available from National Highways by visiting www.trafficengland.com website and travel apps, or by calling 0300 123 5000.