Originally Posted by Duesenflieger

Horizon also operates predominately in a region of the United States in which mountainous terrain is prevalent, yes? Perhaps it feels the need based off safety data that aircraft being established on an IAP before acceptance of a visual will mitigate the risks associated with visuals at night. It is actually a good idea in mountainous terrain to do so.... There are all kinds of visual and vestibular illusions which have caused accidents in aviation history.