A1M SHUT SOUTHBOUND: Hertfordshire Chaos as Police Incident Halts Traffic
The A1M in Hertfordshire is completely closed southbound between Junction 3 (Hatfield) and Junction 1 (South Mimms, M25) right now. Hertfordshire Police are leading the operation, with Highways England stepping in to help manage the chaos.
Expect Major Delays – Plan Extra Journey Time
Drivers heading this way should brace for heavy disruption. To avoid sitting in traffic, leave earlier and take note of the diversion signs marked with a hollow black circle to guide you around the closure.
Follow This Diversion Route
- Exit A1M at J3 (Roehyde Roundabout) and take the 2nd exit onto the A414 North Orbital Road heading towards St Albans.
- At the next roundabout, take the 4th exit towards London Colney on the A1081.
- Approach the following roundabout and take the 2nd exit onto the M25 at Junction 22, heading towards Junction 23 South Mimms.
- Leave the M25 at Junction 23 South Mimms to rejoin the A1(M).
Keep your eyes peeled for the diversion signs and stay safe out there.
