Just wondering if there's a primer for what exactly each shape file includes/represents, as I can't seem to find one. I understand that some of the US data comes from TIGER, and I've seen the naming scheme for them (though, I'm still confused as to what the different road files under each state include). Some of the files are pretty obvious, but others are not. For instance, what is the difference between all of the files for the 'HighwayNetwork' or UsHigh?
Thanks for everything!