Gwent Police is continuing to appeal for information following a serious road traffic collision on the A48 at Pwllmeyric, Chepstow which occurred around 1:55am on Saturday.
A 32-year-old male from Newport sustained life threatening injuries and remains at the Heath Hospital, Cardiff in a critical condition.
The vehicle involved left the scene. It is believed to be a White Ford Transit Van.
Gwent Police are appealing to the public for any information that may assist with identifying and locating this vehicle.
Anyone who may have any information that may assist is asked to call 101, quoting log: 44 17/02/2018.