Which of the following is an example configuration of Emergency-Vehicle Traffic Control Signals?

The choice of a three-section traffic signal with circular red, circular yellow, and smaller circular yellow indications is a well-established configuration for Emergency-Vehicle Traffic Control Signals. This type of signal facilitates the safe and efficient passage of emergency vehicles through intersections. The circular red indicates a stop, while the circular yellow serves as a caution signal, alerting drivers that the signal will soon change. The smaller circular yellow indication provides additional guidance, often directed specifically at drivers of emergency vehicles or those at the intersection, further enhancing situational awareness and safety.

This configuration is effective because it clearly communicates the status of the intersection to all road users, ensuring that emergency vehicles can navigate through without unnecessary delays while helping to minimize risks of accidents with other vehicles. The design and usage of these signals align with principles of traffic management that prioritize the urgency of emergency responses while maintaining orderly traffic flow.