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Primary highway (hard surface). A primary highway is an all-weather, hard surface road. Primary highways include Federal Interstate routes, primary State routes, expressways, turnpikes, freeways, parkways, throughways, and other roads of equivalent importance. |
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Secondary highway (hard surface). An all-weather, hard surface road. This class includes secondary State routes, primary county routes, and comparable through roads connecting principal towns and cities. |
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Light-duty road (improved surface). Roads with lighter, mostly local, traffic. Light duty roads include paved roads not included in a higher class, and loose-surface roads that qualify as all-weather roads. |
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Unimproved road (unsurfaced). Unsurfaced roads are used for mostly local traffic, passable in fair or dry weather. |
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Trail. Trail classification includes foot trails, bridle trails, ski trails, historic trails, and old railroad grades.
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Dual Highway. Road with opposing traffic lanes.
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Dual Highway with median strip. |
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Road under construction. |
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Underpass; Overpass. |
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Bridge. |
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Drawbridge. |
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Tunnel. |
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