What does a yellow traffic light indicate?

A yellow traffic light indicates that the signal is about to change to red, and it serves as a warning for drivers to prepare to stop. This light is a crucial component of traffic control, as it informs drivers that they need to reduce their speed and make decisions to ensure safety as they approach the intersection. If a driver is already in the intersection when the light turns yellow, they should continue safely through and clear the intersection.

In contrast, the other options do not reflect the intended purpose of a yellow light. Speeding up is not advised since the impending red light requires caution and stopping if possible. The assertion that it is safe to pass through during a yellow light is misleading, as it indicates an imminent stop. Yielding to the right is unrelated to the yellow light's function and pertains more to right-of-way rules at intersections. Knowing that the yellow light signals an upcoming transition to red is key to maintaining traffic flow and safety on the roads.