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When you encounter a non-functioning traffic signal, treating it as a four-way stop is the appropriate action to take. This means that every vehicle at the intersection must come to a complete stop, just as they would at a standard stop sign. After stopping, drivers should proceed with caution, allowing those who arrived at the intersection first to continue before proceeding themselves.

This approach is vital for ensuring the safety of all roadway users, as it helps prevent collisions at intersections where the traffic signal is out. By treating it as a four-way stop, drivers are prompted to be vigilant and considerate of others.

The other options do not promote the same level of safety and structure needed in this situation. For instance, treating it as a yield sign would imply that not stopping is permissible, potentially leading to dangerous interactions with other drivers. Continuing through without stopping completely disregards the safety protocols necessary when traffic signals are not operational. Waiting for a police officer to direct traffic could create unnecessary delays and is also not practical in scenarios where no officer is present. Thus, the safest and most universally accepted procedure is to regard the non-functioning signal as a four-way stop.