An ESA spokesman confirmed the man, who is in his 60s, suffered head injuries during the crash on Hindmarsh Drive near Brierly Street but was in a stable condition.

Police remained on the scene, where the eastbound lane of Hindmarsh Drive was briefly closed.

As of 8am, an ACT Policing spokeswoman said traffic was moving again, but slowly.

Commuters are advised to avoid the area if possible.