Police are appealing for witnesses following a collision on the A483 in Chester.
The collision occurred at around 6.45pm on Wednesday 23 June involving two vehicles – a blue Audi and a blue Toyota.
The Toyota travelled down an embankment and the driver was extricated from the vehicle.
The 29-year-old was taken to Aintree Hospital by air ambulance and is currently in a serious but stable condition.
The occupants in the Audi are not believed to have sustained any injuries.
Police investigating the collision are keen to hear from anyone who witnessed it take place and are also appealing for dashcam footage that could assist with enquiries.
Sergeant Andrew Dennison, from the Serious and Complex Investigation Unit, said: “Our enquiries remain ongoing to establish the circumstances surrounding the collision that took place.
“As part of our investigation we would like to hear from members of the public who may have seen the collision, or have any information, to get in touch.
“I am also keen for people to submit any dashcam footage they have that could assist with the investigation.”
If you have information or dashcam footage please contact Cheshire Constabulary on 101 quoting IML 1020672 or visit the website https://www.cheshire.police.uk/