# download them all
wget -ci <( baseuri="ftp://ftp2.census.gov/geo/tiger/TIGER2014/ROADS/"; escaped_baseuri=$(echo "$baseuri" | sed "s:\/:\\\/:g" | sed "s/:/\\\:/g"); lftp -e 'find;exit' "$baseuri" | sed "s:^:${escaped_baseuri}:g" )
# make  single text file of unique FULLNAME roads names
find_ext zip | parallel -j2 'tmp=$(mktemp -d); unzip -d $tmp {} $(basename {} .zip).dbf; dbfdump --fields FULLNAME $tmp/*.dbf | grep -vE "^\s*$"; rm -r $tmp' | grep -vE "(Archive|inflating)[:]" | sed '1 i\FULLNAME'| sortfreq > ~/fullname_uniq.txt