I will start by making it clear that I do not know anything about this incident. It is simply a suggestion.
Heading south on the Tuggeranong parkway tonight at about 5:20 traffic was slow, VERY slow. Turns out, police had closed the section of the parkway which heads under the cotter road, co-incidentally also where a (revenue raising & dangerous in my oppinion) speed camera is placed.
Is it known why the road was closed in this section? I presume it was due to some kind of car accident – caused by somebody hitting the breaks upon reaching the speed camera?