Two people have been taken to hospital in a stable condition after their car rolled multiple times and landed upside down on the Federal Highway near Sutton.
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The other two people in the car were treated at the scene by paramedics.
It marks the third serious accident on ACT roads and surrounding NSW roads on Monday, in which one person was killed, six people were injured and four sent to hospital.
ACT ambulance service duty officer Chris Barry said witnesses reported seeing the grey Toyota roll several times before coming to a stop across one lane.
The ACT ambulance service joined ACT Fire and Rescue, ACT Police, NSW Ambulance and NSW Police at the scene.
Cars were being diverted before the Sutton exit heading into Canberra.
Earlier, a person was killed in another single vehicle crash on Lachlan Valley Way on the Yass side of Boorowa.
The crash, which happened about 10km south of Boorowa at 8.15am on Monday, is being investigated by police.
And at about 1pm, firefighters freed a man and a woman who were trapped in the wreckage of a car accident in Canberra's north.
Emergency services personnel used the jaws of life to free the two people who were taken to Canberra Hospital for further treatment.
The woman, believed to be in her 20s, is in a serious condition with multiple injuries. The man, in his 50s, is in a stable condition with abdominal injuries.
The accident occurred shortly before 1pm on Mirrabei Drive in Ngunnawal.