Final answer:
The 8-sided sign found on highways is universally known as a stop sign, indicating drivers must come to a complete stop and proceed when safe.
Step-by-step explanation:
The only 8-sided sign you'll see on a highway is a stop sign. When you come across this sign, you are required to bring your vehicle to a complete halt at the designated stop line, before the crosswalk, or at the point nearest the intersecting roadway where the driver has a view of approaching traffic. Not only are stop signs designed with a distinctive octagonal shape, but they are also universally red with white lettering, making them easily recognizable to drivers around the world. In terms of interpretation, there should be no confusion; a stop sign means that you must stop completely, check for any pedestrians and oncoming traffic, and proceed only when it's safe to do so.