What does a solid red traffic light mean?

Answer: B — Stop completely before the intersection

A solid red traffic light indicates that drivers must come to a complete stop at the intersection before proceeding. This is a fundamental traffic rule designed to ensure the safety of all road users, including pedestrians and vehicles, by clearly signaling that vehicles must halt. The stop at a red light allows for controlled traffic flow and helps prevent accidents that could occur from vehicles crossing an intersection without yielding the right of way. By requiring a complete stop, the traffic light provides a clear directive that promotes order on the road. It is essential for drivers to acknowledge that they cannot proceed until the light turns green or they are directed by traffic signs or authorities to do otherwise. The other options suggest actions that do not align with the regulations associated with a red light, such as proceeding with caution or slowing down without stopping, which could create confusion and lead to potentially dangerous situations.