2012. Geological Survey (U.S.). This map layer portrays the major roads in the United States, Puerto Rico, and the U.S. Virgin Islands. The file was produced by joining the indivi... Geological Survey (U.S.).
2012. Pribyl, Cindy and California. Department of Transportation. This point shapefile contains traffic volume (also known as traffic counts) on California's state highway network created from 2012 Average Annual ... California. Department of Transportation.