What action should be taken when you see a yellow traffic signal?

When you see a yellow traffic signal, the appropriate action is to slow down and prepare to stop. A yellow light serves as a warning that the traffic light is about to change to red, indicating that vehicles should not enter the intersection if they haven't already. The purpose of the yellow signal is to alert drivers that it's time to make a decision: either safely stop if they can do so without risking a collision, or proceed through the intersection if stopping would be unsafe.

The other choices do not align with the safe driving practices associated with a yellow signal. Speeding up to clear the intersection might lead to dangerous situations, especially if the light changes unexpectedly. Ignoring the signal completely disregards traffic laws and can result in accidents. Turning back is not a feasible option once you are at the intersection and has the potential to create confusion and hazards for other drivers. Thus, slowing down and preparing to stop is the safest and most responsible response to a yellow traffic signal.