Motorists allege they were used as a makeshift roadblock during the Tullamarine Freeway chase - a practice explicitly forbidden by Victoria Police, and one which might have put lives at risk.

Victoria Police continue to refuse to answer questions about the incident due to the matter being before the courts, but have announced an internal inquiry which will focus on whether a roadblock was used.

14 vehicles were damaged and one was written off after an allegedly-stolen van ploughed into the makeshift roadblock.

Two motorists who were in separate cars told Fairfax Media they were stopped by a makeshift police roadblock on the Tullamarine on Sunday. They were ordered by police to stay in their cars.