Officers of the Road Policing Unit are appealing for witnesses and information following a road traffic collision in South Oxhey.
A black BMW 335i lost collided with several parked vehicles in Prestwick Road, just before 11pm on Sunday 5 September.
It is not known how the driver lost control at this time.
The driver was rushed to hospital where he remains in a serious yet stable condition.
Sergeant Aaron Murphy, from the BCH Road Policing Unit, said: “Enquiries are continuing at this time to establish the circumstances around the collision. As part of this, we are appealing for any witnesses to come forward. Did you see the collision itself, or did you see the vehicle being driven in the area prior to it?
“We’d be particularly keen to hear from anyone who captured dash cam footage. If you can help, please contact us.”
Anyone with information asked to please contact Sgt Murphy via email. Or call 101.