A road closure is in place on the A1000 near Brookmans Park following a three-car crash.
The collision – involving a Range Rover, Toyota Yaris and a Ford Fiesta – happened on the northbound carriageway of Great North Road, between Kentish Lane and Shepherds Way.
A police spokeswoman said: “Officers were called at 4.38pm today to reports of a collision on Great North Road, near Brookmans Park.
“Police have attended the scene and put road closures in place to allow the vehicles to be recovered.
“No one is thought to be seriously injured.
“Motorists are advised to avoid the area as it is currently congested.”
Herts County Council Highways also confirmed that delays are occurring in both directions.
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