A man has been arrested following a hit-run collision in Seaford early yesterday.
An off-duty police officer, cycling to work along Nepean Highway, was located injured on the side of the road about 6am.
The 61-year-old man was taken to hospital with serious injuries where he remains.
It is believed he was struck by a white utility which did not stop to render assistance.
The ute was spotted parked at a service station on Nepean Highway in Chelsea, by a fellow road-user who also reported the vehicle was being driven erratically about 8.35pm.
Officers followed the vehicle through Edithvale and Aspendale before it was intercepted in a service lane off Nepean Highway in Mentone about 9.05pm.
The 42-year-old was arrested without incident.
The Seaford man, who was last night deemed not fit for interview, is expected to be interviewed today.
The vehicle was towed from the scene and will be forensically examined.
Frankston Crime Investigation are investigating.
Anyone with dashcam vision or motorists who may have witnessed the driving behaviour of the Isuzu DMAX white ute is urged to call Crime Stoppers on 1800 333 000.