ACT Policing is calling for additional witnesses and information to assist as investigations continue into a collision in Franklin on Saturday.

In particular, police would like to speak to anyone who may have witnessed or have dash camera footage of three vehicles seen driving on Flemington Road and the Federal Highway shortly before the collision.

The vehicles are a red Ford Ranger utility, a white Toyota Hiace van, and a white Subaru Liberty sedan.

Anyone with information should contact Police on 131 444.