Why do truckies tailgate on freeways?

What is with big rigs in Australia and hogging the right-hand lane on busy freeways, essentially tapping the small car in front, with all that speeding 120km/h speed and road rage anger along with it?...

Who else sees this dangerous and intimidating Aussie problem lately?

On 3AW radio Drive with Jacqui Felgate today in Melbourne, she had a big segment on this, with lots of callers, including some bad incidents with young female drivers and also older male truck drivers ringing up.

Where are you? Where have you seen in? What happened? Who was truly at fault? What was the aftermath?

Name some common occurances or locations?