What light signal is used at night to indicate a good landing area for someone in distress?

A vertical motion of a white light or flare is recognized as a signal indicating a good landing area for someone in distress during nighttime scenarios. This signal is specifically designed to attract attention and help rescuers identify a safe spot for landing or approach. The vertically moved light or flare creates a distinct visual cue that is easily noticeable, which is critical when someone is trying to make their way to safety.

The other signals, such as a steady red light, are generally associated with warnings or to indicate danger, rather than to signal safety or a landing area. Flashing blue lights are often used by emergency services, while flashing green lights can indicate a safe passage or a point of interest, but none of these convey the specific message of a safe landing area in distress situations as effectively as the vertical white light signal does.