Which of these actions must be taken at a stop sign?

At a stop sign, the correct action is to come to a complete stop. This requirement is crucial for ensuring the safety of all road users. Coming to a full stop allows drivers to fully assess their surroundings, including other vehicles, pedestrians, and potential hazards. It provides an opportunity to check for oncoming traffic and ensures that you are obeying the traffic laws governing intersections.

This complete stop is necessary regardless of whether there seems to be any oncoming traffic, as it enables drivers to make safe and informed decisions before proceeding. Understanding this rule is essential for promoting safety on the roads and avoiding accidents.