What should a driver do if they cannot see clearly while driving?

Using headlights is the correct action a driver should take if they cannot see clearly while driving. Headlights improve visibility during various conditions, such as rain, fog, or nighttime driving. This is crucial for both the driver and other road users, as it ensures that the driver can see the road and surrounding obstacles more effectively.

While the other options might seem logical at first glance, they can lead to unsafe driving practices. Speeding up may place the driver in a more dangerous situation if unclear conditions persist or worsen. Pulling over is a reasonable choice in some scenarios, but without using headlights, a vehicle could become less visible to others on the road, increasing the risk of an accident. Driving as slowly as possible might not always be safe either, as it could disrupt the flow of traffic and create hazardous conditions for other drivers. Utilizing headlights optimally enhances safety and awareness on the road, making it the best course of action in situations of reduced visibility.