Texas DMV Written Driving Practice Exam

The primary purpose of a yellow traffic light is to warn that the light is about to change to red. This warning is essential for drivers, as it signals that they need to prepare to stop if they haven't already entered the intersection. The yellow light serves as a transitional phase between green and red, allowing motorists a brief moment to react—either to clear the intersection if they are already in it or to stop safely if they are approaching. Understanding this function helps ensure safety on the roads. Drivers should be alert when they see a yellow light and make timely decisions without rushing, as running a red light can lead to serious accidents. The other options do not accurately represent the function of a yellow light; for example, it does not indicate a yield situation nor does it specifically facilitate pedestrian crossings or indicate lane changes. This knowledge is crucial for safe driving practices and compliance with traffic laws.