Before 8am on Saturday, a man was taken to hospital after a two-car collision in Tharwa. The two cars collided on Boboyan Road at about 6am and a call was made to emergency services.

Firefighters and ambulance crews attended the scene, where hydraulic tools had to be used to free a man from his car.

He was taken to hospital in a stable condition with minor injuries, while another patient was assessed at the scene but did not require hospitalisation.

The morning's second accident occurred between two cars at the Lady Denman Drive and Cotter Road intersection.

Firefighters were called just before 8am, and were again required to use hydraulic rescue tools to free a trapped woman.

The 23-year-old suffered multiple lacerations and leg injuries and was transported to the Canberra Hospital in a stable condition.

The driver of the other car, a 64-year-old male, was taken to the Canberra Hospital with minor injuries.

A police spokesman warned drivers to take care over the Canberra Day long weekend.

"ACT Policing is urging people to drive to the conditions over the long weekend," the spokesman said.

"Stick to the speed limit, and we're reminding drivers travelling in and out of Canberra to take regular breaks."

- with Ben Westcott