Three questions on Fluorescent Pink Incident Management signs

[Pink Jazz]

Note that the color for incident management was originally supposed to be Coral, however, after numerous studies, it was found that the pinker shade of Fluorescent Pink was more effective for drivers to identify.  This leaves Coral as an unassigned color, which as of right now I am not sure if it will ever be used since it can be confused with both Orange and Fluorescent Pink.  Light Blue on the other hand might have some use in the future.