What does a green traffic light signify?

A green traffic light signifies that vehicles are permitted to proceed through the intersection, provided it is safe to do so. This means that if the intersection is clear of pedestrians and other vehicles, the driver can continue moving forward. The green light indicates that the right-of-way is for the vehicles facing the green signal, allowing them to safely and legally advance.

In applying this understanding to the context of the other options: stopping completely would be inappropriate as that is not the directive of a green light. Similarly, preparing to yield or proceeding with caution is not the primary instruction that a green light conveys, which is primarily about indicating permission to go once it is safe. It promotes the flow of traffic, encouraging drivers to move when it is clear, which is the essence of what a green traffic signal represents.