The Delaware Department of Transportation assigns priority levels to each road, taking into account the amount of traffic it typically carries, population density in the surrounding areas and how crucial it is to functioning of the overall road system.
To learn where your road is classified, please visit the following website, which has links to maps of each county:
Roads are typically assigned to one of three major categories:
Primary Roads, also known as Arterial Routes and/or Expressways
Definition: Multi-lane highways, and some two-lane roads designed to carry heavy traffic volumes between major destinations.
Secondary Roads, also known as Collector Routes
Definition: These roads receive less traffic than primary roads, but are the main feeder routes to the primary roads.
Definition: Roads that are used to travel to and from less densely populated residential or agricultural areas, used primarily by those who live along them.