Traffic was stalled in Hawker and Lyneham after separate crashes in slippery conditions on Tuesday morning, which also saw a car roll over on Fairbairn Avenue.
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A four-car crash badly affected city-bound traffic on William Hovell Drive in Hawker, with cars backed up all the way to Belconnen at one point.
A two-car collision slowed southbound traffic on the Barton Highway between Northbourne Avenue and Randwick Road.
Only one southbound lane remained open while tow trucks removed the vehicles.
"It was just before the Northbourne Avenue turnoff," the spokeswoman said.
"Attempts are being made to get the cars out of the way."
A car also rolled on Fairbairn Avenue near Campbell around 7.30am.
The incidents occurred after 0.6mm of rain on Tuesday morning, with scattered showers forecast throughout the day.
ACT police warned motorists to avoid both areas if possible.
