Knowing the rules of the road before setting off in a two-ton vehicle is necessary to protect both yourself and other drivers from accidents resulting from ignorance of automotive etiquette. Three-way stop signs, because somewhat uncommon, are often confusing to drivers.
Stop at or slightly before the actual sign (or line painted across the road). Bring your vehicle to a complete halt.
Remember that right-of-way belongs to the first car stopped at the stop sign and continues until all cars have passed.
Keep in mind that if multiple cars stop at the same time, the vehicle on the left should yield to the vehicle on the right.
