What does a flashing red light mean?

Answer: B — To stop and then proceed

A flashing red light signals a stop for vehicles. It indicates that drivers must come to a complete stop, just like they would at a stop sign. Once the vehicle has stopped, the driver may proceed only when the way is clear and safe, meaning they should check for cross traffic or pedestrians before moving forward. This is a critical traffic rule that ensures safety at intersections and locations where visibility might be restricted. Other possible options, while they sound reasonable, do not convey the specific requirement imposed by a flashing red light. For instance, simply proceeding with caution does not fulfill the safety protocol necessary for this signal, nor does driving through without stopping, which could lead to dangerous situations. Yielding to pedestrians is important but is not the primary instruction given by a flashing red light; it is a part of following the proper procedure after stopping.