What should you use to signal to other drivers that you are in trouble?

Using emergency hazard lights is the appropriate way to signal to other drivers that you are in trouble. When activated, these lights flash simultaneously to indicate that your vehicle is experiencing an issue or that you are parked or stopped in a potentially dangerous situation. This alerts other drivers to exercise caution and navigate around your vehicle safely.

In contrast, brake lights indicate that you are slowing down or stopping, which does not communicate an emergency situation. Turn signals are used to indicate a change in direction, like a lane change or a turn, rather than signaling trouble. The horn can be used to get someone's attention or warn of danger, but it does not visually signal to other drivers that you are in distress. Thus, emergency hazard lights are the most effective and recognized method for communicating that an urgent situation is at hand on the road.