What is the consequence of the traffic signal light showing yellow?

The choice indicating that one shall stop before entering the intersection, unless stopping would be unsafe, is correct because it reflects the standard traffic regulation associated with a yellow signal. A yellow light typically serves as a warning that the signal is about to turn red, signaling drivers to prepare to stop. The law emphasizes that drivers should stop when it's safe to do so, but if stopping might pose a danger—such as in cases where a vehicle is too close to the intersection to stop safely—then continuing through the intersection may be necessary.

The focus of this guidance is on safety and the responsibility of the driver to react appropriately to changing traffic signals. It ensures that traffic flow remains organized and minimizes the risk of accidents during transitions from green to red lights. This understanding leads to prudent behavior by drivers, who must assess their surroundings to make a safe decision.

While other choices might suggest alternative actions, they do not align with the primary intent of the traffic signal system, which prioritizes safety at intersections. Knowing when to stop and when it is unsafe to do so is foundational in traffic law and vital for preventing collisions and ensuring smooth traffic flow.