What can be used in emergency situations until traffic control devices arrive?

Answer: A — Emergency vehicle flashers

Using emergency vehicle flashers in an emergency situation is appropriate because they serve as a visual warning to other motorists that there is a situation requiring their attention and caution. Flashers alert drivers to reduce speed and navigate around the area safely until proper traffic control devices can be put in place. This immediate action can help prevent accidents and ensure the safety of both motorists and emergency responders. While traffic cones, sign boards, and construction barrels are also effective tools for traffic control, they typically require time and personnel to deploy correctly. In an emergency, the priority is quick action to manage traffic and maintain safety, making the flashing lights from emergency vehicles the most convenient and effective initial response.