I went at least 20 miles down the Stuart Highway in South Australia right before Dawn when I finally spotted an oncoming vehicle's headlights. As he got closer (and the sky was brightening), I realized I was on the wrong side of the road since I left Woomera!
It really is in a almost unpopulated desert, but the Stuart Highway is the main middle North-South route on the entire continent (From Adelaide in the far South to Alice Springs and finally Darwin in the far North).
Luckily, still almost no traffic overnight except for Road Trains! And further lucky for me, the oncoming vehicle was just an old Holden (car). I'd HATE to hit a Road Train!
Typical Aussie Road Train. Some pull 4, even 5 trailers!