What is one of the roles of yellow traffic signals in traffic management?

The role of yellow traffic signals is to indicate to drivers that they should prepare to stop. This signal acts as a warning to alert drivers that the light is about to change to red, which means they need to be ready to halt their vehicles safely and, when applicable, prevent running a red light. The yellow light serves as a transitional phase between the green signal, which indicates it is safe to proceed, and the red signal, which requires vehicles to stop.

This single purpose is crucial for maintaining the flow of traffic and ensuring safety at intersections. The yellow light conveys the message that drivers should assess their speed and distance from the intersection to determine if they can safely stop before the light changes to red. Understanding this role helps drivers react appropriately and reduces the risk of accidents at traffic signals.