Under what circumstances must you always stop your vehicle?

You must always stop your vehicle at stop signs, red lights, and when approaching school buses that are loading or unloading children. This requirement is critical for ensuring the safety of all road users, particularly children.

When you approach a stop sign, you're required to come to a complete stop before proceeding, allowing you to check for oncoming traffic, pedestrians, and other hazards before continuing. Similarly, red lights signal that you must stop and wait until the light turns green; this is essential for preventing accidents at intersections.

When it comes to school buses, the law mandates that you must stop when the bus has its stop sign extended, indicating that children are getting on or off. This rule is particularly important as it protects vulnerable students who might be crossing the street.

Stopping at these specified points is crucial for maintaining safety on the roads and is not something that should be taken lightly or disregarded. Other circumstances, such as pedestrian crossings or yellow traffic lights, have specific rules that may allow for caution or the opportunity to proceed, but the scenarios specified in the correct choice require a full stop regardless of the situation.