Are drivers required to use headlights during rain or fog in Iowa?

In Iowa, drivers are required to use headlights during poor visibility conditions, which include situations such as rain or fog. This law is intended to enhance safety by ensuring that vehicles are visible to other road users when visibility is significantly reduced.

When visibility is poor, relying solely on daytime running lights or natural light is often insufficient for maintaining safety on the road. The use of headlights during these times not only makes your own vehicle more visible but also helps to illuminate the road and surroundings, thereby improving the overall driving conditions for everyone.

In contrast to the other options, which provide conditions that may limit the use of headlights, the correct understanding is that any situation where visibility is impaired, such as rain or fog, necessitates the use of headlights. This ensures compliance with Iowa law and promotes safety for all road users.