Herts Police are dealing with the incident (Image: Archant)
A warning of increasing traffic jams has been issued after two vans collided on the M1 this evening.
One lane is closed northbound at junction eight and on the sliproad, after a van overturned during a crash with another van.
Delays are currently estimated at 30 minutes but are expected to build.
Herts police are currently on the scene.
For more information about traffic, visit www.trafficengland.com
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