You Know you are in this state

[STLmapboy]

You know you're in West Virginia when they start breaking out the fractions on the secondary highway shields.

Oh, and also this.

[Avalanchez71]

You know you are in TN when you see the direction arrows pointing inward toward each other in lieu of outward.  You know you are in TN when you see myriad of directional suffix highways.

You know you are in TN when you see a doublewide across the street from a million dollar barn and a multi-million dollar home.

[plain]

You know you're in North Carolina when you see a sign telling you to "burn headlights"  when it's raining.

Also, this:

Image from GSV


moto g(7) optimo (XT1952DL)