In what situation should you stop before crossing an intersection?

Stopping before crossing an intersection is essential for safe driving, especially when there is a stop sign present. A stop sign indicates that drivers must come to a complete stop, check for oncoming traffic, pedestrians, or any other potential hazards before proceeding. This rule is in place to ensure the safety of all road users and to prevent accidents.

In contrast, crossing an intersection with a green traffic light does not require stopping unless there are specific circumstances such as pedestrians crossing or emergency vehicles present. The presence of other vehicles only necessitates stopping when it is required by traffic regulations, which is not the case when the light is green. Lastly, making a turn at an intersection does not inherently require a stop unless signaled by a stop sign or other traffic control devices. Therefore, the correct answer emphasizes the legal requirement to stop at intersections marked by a stop sign to promote road safety and compliance with traffic laws.