Which of the following best defines the instruction given by a "Yield" sign?

The best definition of the instruction given by a "Yield" sign is to proceed and watch for traffic. A yield sign indicates that a driver must slow down and be prepared to stop if necessary, giving the right-of-way to any oncoming vehicles or pedestrians. The driver is expected to assess the traffic situation and only continue driving when it is safe to do so, which emphasizes vigilance and caution at intersections or merges.

While a yield sign does not require drivers to come to a complete stop in every instance, it does necessitate awareness of surrounding traffic conditions and obstacles. This allows for a smoother flow of traffic while ensuring safety.