A helicopter was called out after a pedestrian was left with "serious injuries" in a crash in the early hours.

Herts Police closed The Avenue, Bushey, after being called to a “serious road traffic collision” just after 4.30am this morning (January 17).

At 5.30am the force confirmed that the road was “expected to remain closed for some time” and it remains shut as of 11.30am.

According to Hertfordshire Highways, police at the scene have been “carrying out investigations”.

An East of England Ambulance spokesperson said: “Two ambulances, one ambulance officer vehicle, and Essex and Herts Air Ambulance were called to The Avenue, Bushey, in the early hours of this morning following reports of a pedestrian injured in a road traffic collision.

“One man with serious injuries was transported to St Mary's Hospital by road ambulance.”

Herts Fire and Rescue were not called to the road. Herts Police have been contacted for more information.