All three types of highways together provide access to all incorporated and unincorporated areas in all 23 counties of Maryland as well as the independent city of Baltimore.
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Examples of highways within this category include parkways, such as the Clara Barton Parkway or Sligo Creek Parkway; streets on federal research campuses, such as those of the National Institutes of Health or Goddard Space Flight Center; roads on military bases, such as those on Fort Meade; and roads within reservations of the National Park Service, such as Bayberry Drive within Assateague Island National Seashore.
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