What does it mean if a driver sees a solid green light?

Answer: B — Proceed through the intersection

A solid green light indicates that a driver has the right of way and can proceed through the intersection. This means they can continue driving straight or make a turn, provided it is safe to do so. A green light signals that the traffic in the opposite direction is stopped, allowing the driver to move forward without the need for additional signals or delays. In contrast, the other choices involve actions that are unnecessary when a solid green light is present. Stopping would be inappropriate and could lead to confusion or accidents, while slowing down and waiting for further signals does not align with the clear instruction given by a green light. Similarly, limiting the action solely to a left turn does not reflect the full permissions granted by the solid green traffic signal.