In which condition are hand signals particularly useful?

Hand signals are particularly useful in poor visibility conditions because they provide a clear and visible way to communicate a driver's intentions to other road users. This is especially important when visibility is compromised due to factors such as fog, rain, or darkness, which can make it difficult for other drivers to see turn signals or brake lights on vehicles. Hand signals can be more noticeable, allowing for better communication and enhancing overall safety on the road.

For instance, in foggy conditions, a vehicle's lights may not be seen from far away, making hand signals a reliable way to indicate turns or lane changes. This method of signaling helps reduce the likelihood of accidents caused by misunderstandings about a driver's actions in low-visibility situations. While hand signals can be used in various circumstances, their effectiveness is maximized when visibility is poor.