#' census tract populations
#'
#' Contains tract identifiers, and some xwalk information and population by
#' tract. Used internally to filter polygons by interpolated population when
#' necessary. Can use helper fcn to attach geometry.
"ct.pops"
#' limited-access hwy codes
#'
#' Identifiers in the FCLASS column of the NHPN highway dataset associated with
#' limited-access highways.
"lac_codes"
#' largest place in commuting zone
#'
#' Used for generating rays.
"largest.plc.in.cz"
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