What's the difference between 应急出口 (yìngjí chūkǒu) and 安全出口 (ānquán chūkǒu) which both mean "emergency exit"? Generally I see


  应急出口
  yìngjí chūkǒu


indicating an emergency exit on a bus, whereas I see


  安全出口
  ānquán chūkǒu


indicating an emergency exit in a building.  I'm not clear on the difference between them.

Question: What's the difference between 应急出口 and 安全出口 which both mean "emergency exit"?

Looking at dict.cn:


应急 = emergency
安全 = safety


This makes me suspect that an 应急出口 can only be used in the case of an emergency, whereas an 安全出口 can be used at other times too.  But I may be reading too much into this.
They are just two different ways to tell you where you can go safely in emergency case.
As you said,

应急 = emergency
(actually emergency is 紧急; 应急 is &quot;for emergency&quot;, which is short for 因应紧急)
安全 = safety

And they really are

应急出口
(safety) exit for emergency
安全出口
safety exit (for emergency)