A multiple vehicle collision in Fyshwick backed up city-bound peak hour traffic by about three kilometres on Friday morning, according to police.
Police said the six-car crash blocked one lane of traffic on Canberra Avenue near the intersection with the Monaro Highway about 8.20am.
No serious injuries were reported, but ACT Policing said the traffic jam quickly built up to be as far back as HMAS Harman near the NSW border at one stage.
It took at least 45 minutes for tow trucks to arrive to clear the crash scene. Police said at 10am the lane had been reopened, but officers were still on scene. Motorists were asked to slow down in the area.