A man was seriously injured after the van he was driving hit a roundabout and flipped onto its side on the A41 early this morning.
The man had to be cut free by firefighters and was taken to Stoke Mandeville Hospital for treatment.
He was driving a white Ford Transit van from Thrifty Rentals when the incident happened at the Aston Clinton roundabout at around 1.50am.
The road was closed until 6.15am while an investigation was carried out and oil and debris was cleared by the Highways Agency.
Traffic was diverted through Aston Clinton while the road was closed.
PC Liz Johnson said: “I would like to hear from anyone who may have witnessed the collision or seen the vehicle being driven from Aylesbury towards Aston Clinton at that time.”
Anyone with information about the incident should call police on 101 and ask for PC Johnson.
Alternatively you can call Crimestoppers anonymously on 0800 555 111.