Which is a recommended action when visibility is poor due to weather?

Turning on your headlights during poor visibility due to weather is crucial for enhancing your ability to see and be seen. This action helps illuminate the road ahead, making obstacles, road signs, and changes in the driving environment more visible. In conditions such as rain, fog, or snow, turning on your headlights not only aids your visibility but also increases your vehicle's visibility to other drivers, reducing the risk of accidents.

Using high beams in poor visibility is generally not recommended, as they can cause glare and make it more difficult for others to see. Reducing speed is certainly a critical safety measure, as is being aware of your surroundings, but it does not address the immediate need for better visibility provided by headlights. Ignoring speed limits is obviously not safe or lawful, and it could exacerbate the dangers associated with poor visibility.