When must you yield the right-of-way?

Yielding the right-of-way is a crucial aspect of safe driving, ensuring that traffic flows smoothly and preventing accidents. The situation described in the correct answer focuses on yielding at intersections where other vehicles or pedestrians are already present. This is a fundamental rule of the road. When you're approaching an intersection, it's important to recognize that vehicles and pedestrians already in the intersection have the right to proceed before you do. Failing to yield in such circumstances can lead to collisions and puts others at risk.

In contrast, while merging vehicles on a highway do require consideration and may involve yielding, there are specific rules governing merging that can sometimes allow for safe entry without yielding. Similarly, a four-way stop requires drivers to yield depending on who arrived first or who is facing a stop sign, but it's a more structured situation than simply yielding to all pedestrians or vehicles already in the intersection. The idea about yielding to vehicles with a louder horn is not a recognized rule and does not align with safe driving practices, as sound does not dictate right-of-way. Understanding who has the right-of-way is essential for safe navigation through intersections, making yielding in those situations the most important priority.