1。You were drving at a speed no more than the one supposed to be when the accident happened.
2. There is no sign that shows a potential hazard would occur at the supposed speed.
3.You had been succesfully avoided a possible head to head crash by driving carefully.
4.The only cause of this accident was lacking of a much lower speed limit,like the one in many similar places, which should be at the responsibility of the tranportation authority.
对你最不利的一点可能是，他们会argue说， the speed limit is the maximum one you could be at, not necessarily the actual one you are driving at.如果那个转弯处又有什么sign indicates the turn is there.那你还得再花点脑筋想想怎么对付。反正有时间就去跟他们练练，nothing to lose.
Anyway,good luck to you!