Abstract: Abstract: The National Highway Planning Network is a comprehensive network database of the nation's major highway system. It consists of the nation's highways comprised of Rural Arterials, Urban Principal Arterials and all National Highway System routes. The data set covers the 48 contiguous States plus the District of Columbia, Alaska, Hawaii, and Puerto Rico. The nominal scale of the data set is 1:100,000 with a maximal positional error of ±80 meters.
Purpose: Purpose: The primary purpose of this geospatial data set is to serve the FHWA needs in highway planning, policy analysis, visualization of the Highway Performance Monitoring System (HPMS) database and network modeling. The NHPN is the digital source used for coding and publishing the FHWA approved National Highway System maps. Supplemental_Information: The NHPN version 2005.08 contains 8 polyline features (RECIDs 4000057, 4000855, 41000287, 41002220, 48000952, 72001074, 72001170, and 72001488) that are each defined by more than 500 shape points. These features will not import correctly into the workstation version of ArcInfo, which has a 500 shapepoint limit. When importing into the workstation version of ArcInfo, the 8 features will be automatically split into 2 features each. As part of this process, attributes are simply duplicated on the split features. Because of this, additonal nodes are added. The additional nodes will have incomplete attribution.
| Field Number | Attribute | Description | Data Type |
| 0 | FID | Internal feature number. | Long Integer representing an object identifier |
| 1 | Shape | Feature geometry. | Geometry |
| 2 | RECTYPE | Identifies arc file records. | Character String |
| 3 | VERSION | Used for maintaining consistency across data files containing alternate releases of the NHPN. The Version Code consists of a leading Version Number (the year of release) and a trailing number (the month of release), thus, 2004.06 describes Major Release for the year 2004 and month 06. | Character String |
| 4 | RECID | A unique numeric ID associated with each arc of NHPN version 2004.06. | Double Precision Floating Point |
| 5 | ORIGID | A unique numeric ID associated with each arc of previous versions of NHPN as appropriate. | Double Precision Floating Point |
| 6 | CTFIPS | 3 digit FIPS code for the county the arc resides. | Integer |
| 7 | LGURB | 3 digit HPMS Urbanized Area code for the Urbanized Area in which the arc lies. A value of 0 indicates the arc is outside any HPMS Urbanized Areas. | Integer |
| 8 | SMURB | 5 digit CENSUS Small Urban Area code for cities under 50,000 population in 2000. A value of 0 indicates the arc is outside any Small Urban Area. | Long Integer |
| 9 | BNDRY | Shows whether or not the selected feature has been edited, or if the feature has been flagged. | Integer |
| 10 | NAME | The NAME field can be any character string used to identify nodes such as the name of nearby towns, geographical features, interstate exits, intersection descriptions, etc. Names need not be unique and cannot contain punctuation characters other than hyphens, underlines, and blank spaces. | Character String |
| 11 | STFIPS | State FIPS code | Character String |
| 12 | BTSVERSION | Version of the database | Character String |