ACT Policing is seeking witnesses and dash-cam footage of a collision between a vehicle and a cyclist on Cotter Road earlier this week.

About 9am on Saturday 4 May, police and emergency services responded to a collision between a silver Mazda CX9 SUV and a cyclist at the intersection of the Cotter Road and Greenhills, Stromlo.

The cyclist, a 36-year-old man, was treated at the scene by ACT Ambulance Service paramedics before being transported to hospital with serious injuries.

The driver of the CX9 has been identified and is providing assistance to investigators.

Police would like to speak to anyone who witnessed the collision, or who may have dash-cam footage of the collision. Police would particularly like to speak to the driver of a red hatchback that was in the vicinity of the crash at the time.

Anyone with information that could assist police is urged to contact Crime Stoppers on 1800 333 000, or via the Crime Stoppers ACT website.  Please quote 7740337. Information can be provided anonymously.