Direct Line of Sight @ 42" w/ glazing starting at 46"?

John, You might refer to page 568 that explains "horizontal view at appropriate eye height". You may allow using higher eye height level if you can provide narrative that your typical eye height for your room is higher than 42" (typical seated eye height). For example, you can use higher number for car showroom if you can explain that majority occupants will do their activities by standing up. For school application example, it may apply to dance classroom. As I remember, there was a CIR regarding this one.