I kid you not about the roadside stops here! But the “Truckies” have to be credited for lobbying for “rest stops” every 60 kilometres or so. The only real issue is bring your own loo paper as the “grey nomads” (retirees travelling Australia with a caravan) keep pinching the paper!
When in doubt, use the one that matches your parts. Perhaps we should put pictures of the parts on the signs instead of outward generic silhouettes.