To warn other vehicles of your approach at a blind intersection at night, which action is correct?

Flashing your headlights is an effective way to alert other drivers of your approach at a blind intersection, especially at night when visibility is reduced. This action serves as a visual warning that can be easily seen by other road users, potentially preventing accidents or misunderstandings about the flow of traffic. Headlight flashes are intuitive and communicate urgency without being overly aggressive, making them an appropriate measure in low-visibility situations.

While sounding your horn can be a means of signaling your presence, it may not be as universally recognized or as effective in all contexts, particularly at night when drivers might not expect an audible alert. Turning on fog lights is intended for adverse weather conditions and can actually confuse other drivers in clear conditions by producing excessive glare. Using turn signals is important for indicating your intended direction but does not serve the purpose of warning others of your presence at a blind intersection. Thus, flashing headlights stands out as the most suitable action among the given choices.