What does a yellow traffic light indicate?

A yellow traffic light indicates that the signal is about to turn red, and drivers should slow down and prepare to stop. This serves as a cautionary signal to ensure that vehicles can safely clear the intersection if they are too close to stop before the light changes. The purpose of this light is to alert drivers that they need to make a decision based on their distance from the intersection: if they are far enough away, they should begin braking to stop; if they are too close, they may continue through the intersection safely. Understanding this helps to enhance safety for both drivers and pedestrians, as it promotes orderly traffic flow.

In contrast, the indication to speed up and clear the intersection is not advisable, as it can lead to dangerous situations where vehicles might rush through a changing light. A yellow light does not signal that the light is about to turn green or that pedestrians have the right of way to cross, as those would misinterpret the intended message of caution and preparation for stopping.