+ 1 for sh*te drivers and speeding.
I can remember on a couple of occasions when in the middle of no-where, hadnt seen another car for miles, and there was a Police speed check at the end of a long straight road. Copper waved at us as we went passed mind, probably as we kept under 100km per hour.
Not worth speeding anyway as generally the scenery is so stunning its worth having a look at.
Its also a lot easier to cover long journeys without feeling too tired afterwards. Even though as already said most of the roads are single carriage way, the lack of other drivers and not having to concentrate at high speed like on a UK motorway makes driving easier, just watch out for the odd idiot.