The Nullarbor represents the boundary between eastern and western Australia, regardless of the travel method. The press might write that a prime minister who visits Perth has "headed across the Nullarbor". "Crossing the Nullarbor", for many Australians, is a quintessential experience of the "Australian Outback". Stickers bought from roadhouses on the highway show "I have crossed the Nullarbor", and can be seen on vehicles of varying quality or capacity for long-distance travel. The process of "beating the crowds" on overbooked and overpriced air services at the time of special sporting events can also see significant numbers of vehicles on the road.