Data set name:
U.S. Major Roads

Description:
The U.S. Major Roads data layer is an Environmental Systems Research Institute 
(ESRI) shapefile that contains interstate, U.S., and state highways and other 
major thoroughfares.  The shapefile overlays accurately on streets and other 
boundary data.  The Major Roads provide an invaluable reference and cartographic 
layer that makes it easy to identify areas on other feature layers.

Fields:
Hwyname -- The primary name of the road feature.(String)
Fcc -- The Census Feature Classification Code of the road feature.(String)
Statefips -- The State FIPS code for the state in which the road segment is 
located.(String)
Alt1_name -- An alternate name of the road feature. (String)

Source GeoDataset names:  
[nn]rds.shp
[nn] represents the standard postal abbreviation for the state.

Source GeoDataset path: 
1999 ESRI Data and Maps 3 (CD) \westusa\[nn], 1999 ESRI Data and Maps 4 (CD) 
\eastusa\[nn], 1999 ESRI Data and Maps 5 (CD) \southusa\[nn]

GeoDataset type: 
An ESRI shapefile with line features. 

GeoDataset lineage: 
The United States major roads data files are provided by Geographic Data 
Technology, Inc. Copyright 1984-1998, Geographic Data Technology, Inc.  All 
rights reserved.  The data are a modification of the Bureau of the Census 
TIGER/Line files.

Coordinate system: 
Latitude/longitude in decimal degrees.

Coordinate precision: 
Double.

Useful display scales:
Largest scale:  1:100,000
Smallest scale:  1:3,000,000