What does a flashing red traffic light mean?

Answer: A — Stop and proceed with caution.

A flashing red traffic light is used to indicate that drivers must come to a complete stop and proceed with caution. This means that drivers must check for oncoming traffic and only proceed when it is safe to do so. Option B is incorrect because a flashing red light, unlike a yellow light, requires a complete stop. Option C is incorrect because yielding the right-of-way is not necessary at a flashing red light. Option D is incorrect because it suggests that drivers should wait for a green light, which is not the case at a flashing red light.