A flashing amber (yellow) signal light at an intersection means:

Answer: B — Slow down and drive with increased caution

A flashing amber signal light signifies warnings/caution that drivers should pay attention to. It means the driver should slow down, be cautious and proceed through the intersection with care. Option A is incorrect because it implies that the driver must come to a full stop which is not the case with a flashing amber signal light. Option C is incorrect as there is no mention of any danger or dead-end highway in the question. Option D is incorrect as it does not provide any information about what the driver should do.