*[http://www.transportation.nebraska.gov/maps/func-city-by-cnty-maps.htm Functional Classification: Cities within Counties]
Lock Levels ===
In Nebraska, we observe a minimum standard for locking roads based on segment type. Any road of a certain segment type must be locked '''at least''' to the rank listed in the chart below. Roads may be locked higher for protection and special situations (construction, confusing design, frequent mistakes, image inaccuracies, etc.), but should not be locked lower.