Which action is considered safe and legal for a driver when at a traffic light?

Stopping for a red light is both a safe and legal action for a driver at a traffic light. This action complies with traffic laws, which are designed to ensure the safety of all road users, including pedestrians and other vehicles. Adhering to traffic signals is crucial in maintaining order on the roads and preventing accidents.

When a driver approaches a red light, the appropriate response is to bring the vehicle to a complete stop before the intersection, allowing time for traffic to clear and ensuring that any pedestrians crossing the street can do so safely. This practice not only respects the rules of the road but also contributes to overall traffic safety by allowing for controlled movement through intersections.

The other options present actions that either violate traffic laws or pose significant safety risks. Running a red light can lead to serious accidents, changing lanes quickly may create hazards for other drivers, and stopping in the intersection can obstruct traffic and create dangerous situations for oncoming vehicles and pedestrians.