What is the main purpose of a yellow traffic light?

Answer: B — To prepare drivers to stop

The main purpose of a yellow traffic light is to prepare drivers to stop. This light serves as a warning that the signal is about to change to red, indicating that drivers should take action to safely stop their vehicles if they can. It is crucial for maintaining the flow of traffic and ensuring safety at intersections. When a yellow light is activated, it gives drivers a brief opportunity to react, reminding them that they may need to stop once the light turns red. This helps prevent accidents that could occur if drivers continue forward without any warning after the green light. The yellow light is an essential part of the traffic control system, as it bridges the transition between the green light, which indicates go, and the red light, which indicates stop.