What is required for vehicles when traveling on Texas highways regarding headlights?

For vehicles traveling on Texas highways, it is essential that headlights are functional and utilized during low visibility conditions. This requirement is in place to ensure the safety of all road users. Low visibility can occur during various situations such as nighttime, rain, fog, or other adverse weather conditions. By using headlights in these circumstances, drivers enhance their own visibility and increase their ability to be seen by others, which greatly reduces the risk of accidents.

The focus on functional headlights emphasizes the importance of proper vehicle maintenance and ensuring that all lighting equipment is in good working order. This not only adheres to legal requirements but also fosters a safer driving environment. It's crucial for all drivers to be aware of the conditions that necessitate the use of headlights, as this contributes to overall road safety initiatives.

The incorrect options do not align with the laws and best practices for safe driving. For instance, turning headlights off during the day or making them optional would compromise visibility and safety, especially in circumstances where they are most needed.