The driver arrested following the collision on the A69 has been released under investigation whilst officers continue with their enquiries.
The collision involved a pedestrian and a car on the A69 at the junction of the Old Chapel Road at Warwick Bridge at around 7.30pm Saturday 27 April.
An air ambulance attended and the pedestrian, a man in his 70s from the Carlisle area was taken to hospital (RVI) having suffered serious injuries.
A 73-year-old man was arrested on suspicion of causing serious injury by dangerous driving, failing to stop at the scene of an accident and failing to report an accident.
A Cumbria Police spokesman said: “The injured man remains in hospital in a critical condition.
“Officers believe there may be people who witnessed the collision who have yet to speak with the police.”
Officers are urging anyone who did see what happened to contact police referencing incident 171 of 27 April 2019.
Officers are also keen to hear from anyone who may have dash cam footage which may have captured the collision or the moments immediately before or after.
Email: [email protected] Call non-emergency number: 101 Or Crimestoppers anonymously on 0800 555 111.