What does it mean if a traffic signal is flashing yellow?

Answer: B — Proceed with caution

A traffic signal that is flashing yellow indicates that drivers should proceed with caution. This signal serves as a warning that there may be potential hazards or that the conditions may not be entirely safe. The intent of the flashing yellow light is to alert drivers to slow down and be prepared to stop if necessary, rather than treating it as a signal to halt completely. In contrast, the other choices do not accurately reflect the proper action at a flashing yellow light. Stopping before proceeding, yielding to all traffic, or speeding up to clear the intersection do not align with the protocol recommended for flashing yellow signals, which focus on cautious movement rather than a complete stop or urgency.