What is the purpose of a flashing yellow signal?

The purpose of a flashing yellow signal is to indicate caution to drivers. This type of signal alerts drivers to approach with care and be prepared to yield to other vehicles or pedestrians as necessary. Unlike a solid yellow light, which typically warns of an impending red light, a flashing yellow signal specifically signifies that drivers should slow down and proceed with caution without making a full stop. It serves as a reminder to be vigilant while navigating through intersections or areas where other traffic might have the right of way. This can be particularly important in scenarios such as construction zones or locations where visibility might be limited. The other options do not accurately describe the function of a flashing yellow signal, as it does not instruct vehicles to stop, signal a lane change, or indicate the presence of emergency vehicles.