While many drivers are aware of the dangers of driving too fast, some don’t see the harm in driving too slowly. While you're more than likely to gain the ire of drivers behind you, remember that driving under the speed limit is legally fine, but driving excessively slowly can land you in a bit of hot water.
According to the NSW Road Rules you cannot drive so abnormally slowly that you cause an obstruction. An example of driving ‘abnormally slowly’ would be if you were travelling at a speed of 20 kilometres per hour on a road with a speed limit of 80 kilometres per hour. As a result, you could be causing an obstruction to other drivers and carries a fine of up to $289.