I don't know exactly where the Nullarbor Plain starts and ends (there are no signs to say) but it seems that 'crossing the Nullarbor' involves driving from at least Norseman in WA to at least Ceduna in SA, or vice versa.
We started from Esperance this morning under grey skies and headed north to Norseman and then began the trek east. On our biggest day of driving for the trip so far we covered around 660 km, stopping for the night at a free rest area called Observatory Turnoff (being near the turnoff for the Eyre Bird Observatory).
During the day we lost 45 minutes as we crossed into some central WA timezone which I was unaware existed. In the afternoon we also drove Australia's longest straight stretch of road. I dozed off a bit during this; fortunately Sal was driving. The kids were watching a movie so didn't even realise.
Tonight I enjoyed the feeling of looking up at the stars in the clear sky - looking at the Southern Cross in the middle of the Nullarbor somehow felt more true blue than doing it in the backyard in Brisbane!