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BTS Home > Publications > National Transportation Atlas Database > 2007

National Highway Planning Network (Line) - Data Dictionary

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: 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, attributes such as MILES and KM become invalid for these features.

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	FNRECID	Identifies a node in the nhpnnod shapefile that corresponds to the starting position of the arc chain.	Double Precision Floating Point
7	TNRECID	Identifies a node in the nhpnnod shapefile that corresponds to the ending position of the arc chain.	Double Precision Floating Point
8	CTFIPS	3 digit FIPS code for the county the arc resides.	Integer
9	SOURCE	Source of feature	Character String
10	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
11	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
12	SIGN1	Contains the designated primary Sign Route for the arc.	Character String
13	SIGNT1	Describes the type of the sign route.	Character String
14	SIGNN1	Contains the actual sign route numbers . Using HPMS standards, an optional directional indicator (N, S, E, W) can also be used as part of this field.	Character String
15	SIGNQ1	Sign Route Qualifier Record which is used to qualify the sign route description follows the Sign Route Number.	Character String
16	SIGN2	Contains the designated secondary Sign Route for the arc.	Character String
17	SIGNT2	Describes the type of the sign route.	Character String
18	SIGNN2	Contains the actual sign route numbers . Using HPMS standards, an optional directional indicator (N, S, E, W) can also be used as part of this field.	Character String
19	SIGNQ2	Sign Route Qualifier Record which is used to qualify the sign route description follows the Sign Route Number.	Character String
20	SIGN3	Contains the designated additional secondary Sign Route for the arc.	Character String
21	SIGNT3	Describes the type of the sign route.	Character String
22	SIGNN3	Contains the actual sign route numbers . Using HPMS standards, an optional directional indicator (N, S, E, W) can also be used as part of this field.	Character String
23	SIGNQ3	Sign Route Qualifier Record which is used to qualify the sign route description follows the Sign Route Number.	Character String
24	LNAME	Contains the local street name for the arc.	Character String
25	MILES	Contains measurement in miles for the feature.	Double Precision Floating Point
26	KM	Contains measurement in kilometers for the feature.	Double Precision Floating Point
27	FCLASS	Identifies the assigned functional class of each arc.	Integer
28	RUCODE	Describes the Rural/Urban classification of the arc.	Integer
29	STATUS	Describes availability of the feature to through traffic.	Integer
30	NHS	Special subnetwork for the National Highway System. The following values were converted per direction from the FHWA: 2 (ISTEA High Priority Corridor) was converted to 7 (Other NHS) , 5 (ISTEA High Priority Corridor/ Non-Interstate STRAHNET) was converted to 3 (Non-Interstate STRAHNET), 6 (ISTEA High Priority Corridor/STRAHNET Connector) was converted to 4 (STRAHNET Connector).	Integer
31	STRAHNET	Special subnetwork for the Strategic Highway Corridor Network.	Integer
32	FAC_ID	FHWA designated Intermodal Facility unique ID.	Character String
33	CONN_ID	FHWA designated Intermodal Facility Connector unique ID	Character String
34	CONN_DES	Description of Intermodal Facility Connectors	Character String
35	CONN_MILES	Total Mileage of the designated Connector.	Double Precision Floating Point
36	LRSKEY	Uniquely identifies a route within a state.	Character String
37	LRSSEQ	NHPN arc mile point sequence number.	Integer
38	BEGMP	Beginning mile point for the NHPN arc segment.	Double Precision Floating Point
39	ENDMP	Ending mile point of the NHPN arc segment.	Double Precision Floating Point
40	AADT	The Annual Average Daily Traffic field comes from the 2002 Highway Performance Monitoring System.	Long Integer
41	THRULANES	The Number of through lanes field indicates the number of striped lanes in both directions. This field does not include auxiliary lanes, such as collector-distributor lanes, weaving lanes, frontage road lanes, parking and turning lanes, acceleration/deceleration lanes, toll collection lanes and truck climbing lanes.	Integer
42	OWNERSHIP	Identifies the road owner	Integer
43	STFIPS	State FIPS Code	Character String
44	BTSVERSION	Version of the database	Character String