A car and van were involved in a collision on the A41 northbound this morning (Friday, September 25).
Police were called at 8.39am after the incident involving a Kia Sportage and a van just after the Hemel Hempstead junction, travelling towards Berkhamsted.
A Herts Police spokesman said: “It was logged as damage only and there were no injuries.
“The inside lane was blocked and we currently have a rolling road block in place.”
It is believed there is still some congestion on the bypass while the vehicles wait to be recovered.