Question In Texas, drivers must use their headlights: Answers When they are tired. When their vehicle has a mechanical problem. 30 minutes after sunset until 30 minutes before sunrise. During the day in clear weather. Explanation Slow down when driving at night and be sure you can stop within the distance illuminated by your headlights. You must use your headlights 30 minutes after sunset until 30 minutes before sunrise. Take a FREE Practice Test Now This questions appears in the following tests: Texas Practice Test