Which of the following is considered a reasonable response when traffic signal power is lost?

When traffic signal power is lost, the safest way to manage the situation is to implement appropriate traffic control measures to prevent accidents and ensure the flow of traffic. Opening emergency stop signs is an effective response as it provides clear instructions to drivers about their responsibilities while navigating through the intersection. This method not only enhances safety but also helps direct traffic in an organized manner, similar to how stop signs function under normal circumstances.

In the context of this scenario, traffic control measures must prioritize safety and efficiency. Emergency stop signs are a proactive solution that addresses the potential chaos and confusion that can arise when traffic signals are non-operational. By clearly marking intersections with stop signs, drivers are reminded to come to a complete stop and proceed only when it is safe to do so, significantly reducing the risk of collisions.

Other responses, such as closing the intersection or all roads, may lead to unnecessary congestion and frustration for drivers, potentially creating more hazardous conditions. Ignoring the incident fails to address the safety concerns altogether, which can lead to accidents or confusion among drivers trying to navigate an uncontrolled intersection. Therefore, the proper course of action is to activate emergency stop signs, guiding traffic effectively until the signals can be restored.