求翻译：从表2-39、表2-40、表2-41、表2-42中我们发现，道路交通事故最容易发生在平直路，在这四个城市中分别占到了 74.87%、63.62%、81.46%和74.78%；是什么意思？

From the tables 2-39, 2-40, 2-41, 2-42, we found that most likely to occur in road traffic accident on a straight road, in the four cities respectively accounted for, 74.87%, and 81.46%;