Texas DMV Written Driving Practice Test

In Texas, the law requires drivers to use their headlights whenever visibility is poor, such as during rain, fog, or other adverse weather conditions. This requirement ensures that you can see the road and other vehicles clearly, while also making your vehicle more visible to others. Poor visibility can be a result of various factors, including heavy rain, fog, or even areas of construction where visibility may be compromised.

While it is important to use headlights at night, relying solely on this scenario neglects the situations where poor visibility can occur during daylight hours. Hence, the answer that states headlights must be used when visibility is poor is the most comprehensive and addresses a critical aspect of safe driving practices in varying weather conditions. The options that mention only using headlights at night or in construction zones do not capture the full scope of when headlights are necessary for safety on the road.