The young man injured in the A505 collision near Stanbridge earlier this morning has died in hospital.
It is understood that the man, in his 20s, was driving on the A505 between the A5 and the first Eaton Bray junction shortly before 6am, when his car left the road and veered into a ditch.
Emergency services were called and the injured man was taken to Luton & Dunstable Hospital but was pronounced dead shortly after 2pm.
It is believed he was from Luton.
PC Robert Hauxwell said: “This was a tragic incident in which a young man sadly lost his life. I would urge anyone who witnessed this incident to call police with information.”
The road reopened just before 1pm. Anyone with any information is asked to call the Bedfordshire, Cambridgeshire and Hertfordshire Roads Policing Unit on 101.