The forum is five years old already!
Because of Lady Bird Johnson, Texas as those wildflowers along many of the highways. Not many other states do it to the same extent.
I-99... the Glen Quagmire of interstate routes??
VDOT likes to plant them in the ROW at some interchanges (I-64 at Northampton Blvd in Norfolk comes to mind). I find that any natural beauty of them is countered by the presence of a "WILDFLOWERS - DO NOT MOW!" sign every 10 feet