What does it mean if a traffic light turns yellow?

Answer: A — The light is about to turn red

When a traffic light turns yellow, it serves as a warning that the signal is about to change to red. This indicates to drivers that they should prepare to stop if it is safe to do so. The yellow light is not a signal to speed up or maintain the current speed; rather, it is an alert for drivers to assess their situation. It's important to note that if a driver is too close to the intersection when the light changes to yellow, they may continue through the intersection safely if stopping would create a hazardous situation. However, the primary purpose of the yellow light is to provide advance notice to drivers about the imminent change to red, which requires vehicles to come to a complete stop.