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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.
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.
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.
White square with black text. Usually has a word like "loop" and then a number on it.
An interstate highway is usually best for long distance travel between major destinations. For short trips or rural destinations it would depend on what routes are available.
I would say the west is mainly urban and the east rural.
Urban describes areas adjacent to large cities. For the most part, Washington is not urban, just some areas around Portland, Seattle and Eugene would be urban.
A vertical Rectangle that will have the word Loop and it's number. And example is on 5-16 of Texas Drivers Handbook that says LOOP 270
Ambulances, search and rescue, police and other law enforcement as needed, State Highway Engineers, insurance representatives, and perhaps Highway Maintenance.
It might be an urban agglomeration, a conurbation or a metropolitan area.