Police officers are searching to find any witnesses of a Markyate crash that left a pedestrian with critical injuries.
At about 4.30am on September 1, Bedfordshire Police were called to the northbound carriageway of the A5183, between Markyate and Kensworth.
A blue Mercedes hit a man in his 20s, who was taken to hospital with serious injuries, and the road was closed.
The man is still in a critical condition.
Sgt Russ Jones from the Bedfordshire, Cambridgeshire and Hertfordshire Road Policing Unit said: "We are appealing for anyone who may have seen the vehicle or the pedestrian at the time of the collision, or a short time before, and in particular anyone who has dashcam footage.
"This information will help us establish what happened."
Anyone with information should contact Sgt Jones on 101 with reference Op Molong.
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