A road sign indicating a state highway generally has a unique design for each state. In South Dakota, the symbol of the road is outlined with borders of the state.
Highway route marker or guidance sign.
loop 270
It depends on your state. Most are black and white but vary in shape, Calfornia has a green state highway sign.
There are different types of highway signs. The type of sign that would let you know that you were on a short state highway in a city or urban area would be a rectangle sign with black writing.
White square with black text. Usually has a word like "loop" and then a number on it.
state
State
The word urban does not have the short e sound in it when pronouncing it. There is no e sound in the word urban. There is a short a sound in the word urban.
Urban
Urban
The distance between two exits on a highway can vary greatly, depending on the area. Often the distance is one mile, but in urban areas it may be as short as 1/4 mile. In very rural areas the distance between two exits can be 10 miles or more.
New York city is urban, but the whole state of New York not urban. The countryside of the New York state is rural.