【正确答案】正确答案：On the face of it, B violated the maxim of relation since he did not provide a direct answer to A"s question. But A would assume that B is cooperative in the conversation, and would try to explore the link between the seemingly irrelevant response to something relevant. Thus, A would interpret B"s utterance in such a way that because there had been as accident further up the road, it was quite possible that the road was blocked; in a consequence, the bus would not be able to come.