Queues on M1 north at Watford. Credit: Highways England
There are major delays this evening due to a crash on the M1.
Two lanes have been shut northbound at junction 6A for the M25.
Emergency services are at the scene, including Hertfordshire Fire & Rescue.
Queues on the M1 are tailing back to junction 4, and it may also affect traffic on Stephenson Way out of Watford towards the M1.
The A41 Colne Way from the M1 to the Dome roundabout is affected as drivers look to avoid the motorway.
The M25 is unaffected by the incident on the M1.
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