A yellow light that flashes on and off indicates what action?

Answer: C — Slow down and proceed with caution

The indication given by a yellow light that flashes on and off is to slow down and proceed with caution. This traffic signal alerts drivers that they should be prepared for potential hazards ahead, as it implies that they are approaching an intersection where the right of way may not be guaranteed. Drivers are expected to reduce their speed, remain vigilant for pedestrians, other vehicles, or any unexpected situations, and navigate through the intersection carefully. The flashing yellow light serves a critical function in alerting motorists to pay close attention and to ensure that they do not rush through the intersection, which could lead to accidents. The options that suggest speeding up, stopping completely awaiting a green light, or stopping and looking without caution do not align with the proper interpretation of a flashing yellow signal. The key takeaway is that caution is paramount when a yellow light is flashing, emphasizing the importance of attentiveness and defensive driving.