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County Level Transportation
Nearest Interstate Highway
Definition:	Distance from county centroid to nearest interstate highway. Distances from county centroid are calculated using GCN's proprietary geographic information system (GIS) technology.
Units:	miles
Example:	6
Interstate Highways in County
Definition:	Number of interstate highways located in the county.
Units:	name
Example:	3
Nearest Commercial Airport
Definition:	Distance from county centroid to nearest commercial airport. Distances from county centroid are calculated using GCN's proprietary geographic information system (GIS) technology.
Units:	miles
Example:	15
Nearest Seaport
Definition:	Distance from county centroid to nearest customs port. Distances from county centroid are calculated using GCN'c proprietary geographic information system (GIS) technology.
Units:	miles
Example:	65
Number of Seaports in County
Definition:	Number of seaports in the county.
Units:	integer

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