A factor in this case is that this highway is in the middle of nowhere. The northern part of Western Australia, especially away from the coast is some of the m

A factor in this case is that this highway is in the middle of nowhere. The northern part of Western Australia, especially away from the coast is some of the most sparsely populated land anywhere. The highway looks like this for pretty much its entire length: https://www.google.com.au/maps/@-24.8925923,119.4609135,3a,75y,263.62h,80.26t/data=!3m6!1e1!3m4!1sICkhNIxM68IIrutyF0jB9Q!2e0!7i13312!8i6656 https://www.google.com.au/maps/@-24.8925923,119.4609135,3a,7... Nobody is stopping regularly by the side of this road to wander around and pick up shiny objects. The search team has thoroughly checked all of the rest stops where the driver took a break, which was easy enough since the truck had GPS tracking.