is it illegal to drive under the speed limit

Driving under the speed limit in Australia isn't typically illegal, but it can be a bit of a road hazard if you’re crawling along like a snail in a hurry hour. The speed limit is the maximum, not the minimum, but driving significantly slower than the flow of traffic might land you in hot water under careless driving or obstructing traffic laws. Police might pull you over if they reckon you’re causing a danger or annoyance by being a rolling roadblock. Just remember, the road is not your personal Sunday drive track, so keep it sensible and safe.