In risk analysis, it is recognized that hazards can often combine to worsen their joint impact, but impact data for a rail network show that hazards can also tend to be mutually exclusive at seasonal timescales. Ignoring this overestimates worst-case risk, so we therefore champion a broader view of risk from compound hazards.

中文翻译：

---

多危害依赖关系可以增加或减少风险

在风险分析中，人们认识到危害常常会合并在一起，从而加重其共同影响，但铁路网络的影响数据表明，在季节性时标上，危害也往往是互斥的。忽略这种情况会高估最坏情况的风险，因此，我们主张从更广泛的角度考虑复合危害的风险。