What is the primary purpose of stop signs?

The primary purpose of stop signs is to require drivers to come to a complete stop. This requirement is crucial for ensuring safety at intersections, particularly where visibility may be limited or where pedestrians may be crossing. When approaching a stop sign, drivers need to fully halt their vehicle and assess the intersection for any oncoming traffic or pedestrians before proceeding. This practice helps prevent accidents by creating clear rules for vehicle movement, allowing drivers to make informed decisions based on the conditions at the intersection.

The other options describe relevant concepts in traffic management but do not specifically capture the fundamental intention behind stop signs. For instance, while stop signs do inform drivers of traffic regulations, their unique purpose is the mandate for a complete stop. Additionally, while yielding to pedestrians is an important consideration for drivers, particularly at crosswalks, it is not the sole objective of a stop sign, as they serve broader intersection safety purposes. Finally, directing traffic flow is a general function of various traffic devices and signals, but stop signs specifically enforce a stop before proceeding rather than managing continuous movement.