Which of the following actions is considered a violation of Texas traffic law?

Driving without headlights at night is a clear violation of Texas traffic law. In Texas, regulations state that headlights must be used from sunset to sunrise and during any periods of reduced visibility, such as fog or heavy rain. Not using headlights at night not only endangers the driver but also poses a hazard to other road users, making it imperative for all vehicles to be clearly visible. This action can lead to traffic citations and also increases the risks of accidents due to impaired visibility on the roadway.

In contrast, yielding to emergency vehicles, stopping for pedestrians in designated crosswalks, and using turn signals when changing lanes are all actions mandated by Texas traffic regulations aimed at promoting safety on the roads.