And all I can think of is 'what state is "CHAPTER"?'

Okay, now everyone gets to see how much of a road geek I really am..

State names are no longer placed on any road Marker signs, with one exception.
Sign M4-1, the US Highway sign is to only have the route number, and one of "Business", "Loop", or "Spur" on the sign itself. Other auxilliarry markers allowed are the standard directional (North, South, East, West), as well as "Alt", "Detour", "Jct", "To", among a few other less-known ones.

The last Marker sign to have state names on it were M1-1, the Interstate signs. Only Georgia (possible one other state) puts their state name on it, and the sign's designation is "M1-1a". Otherwise, they figure that you know what state you're in.

Okay. Shutting up now.
Me.