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Flashing brake lights to warn of stopping is considered a proper use of vehicle lights and flashers because it serves as an effective communication tool between drivers. When a driver flashes their brake lights, it alerts other road users to their intention to stop or slow down, which can help prevent collisions. This is particularly important in situations where visibility may be reduced, or when a driver needs to stop unexpectedly, allowing following vehicles to react accordingly.
Using headlights during daylight regardless of visibility is not optimal, as headlights should only be used when needed to ensure visibility and safety. In foggy conditions, turning off lights can create a hazardous situation, as other drivers may not see the vehicle at all. Finally, turn signals are essential for all driving situations, including on highways, and should always be used to indicate lane changes or turns to improve safety on the road. Thus, the correct choice emphasizes the importance of clear communication with other drivers regarding stopping and slowing down.