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#' Road Network
#'
#' Function returning data frame of roads of the Czech Republic as `sf` lines. It has no obligatory parameters.
#'
#' Due to package size constraints the data are stored externally (and a working internet connection is required to use the package).
#'
#' The data is current to December 2020. Downloaded size is 6 MB.
#'
#' @return `sf` data frame with 59.594 rows of 3 variables + geometry:
#'
#' \describe{
#' \item{TRIDA}{Class of the road:}
#' \itemize{
#' \item highway = dálnice,
#' \item speedway = rychlostní silnice,
#' \item 1st class road = silnice I. třídy,
#' \item 2nd class road = silnice II. třídy,
#' \item 3rd class road = silnice III. třídy,
#' \item other road = neevidovaná silnice
#' }
#' \item{CISLO_SILNICE}{Local road code}
#' \item{MEZINARODNI_OZNACENI}{International road code}
#' }
#'
#' @source Mapový podklad – Data200, 2021 © Český úřad zeměměřický a katastrální. <https://www.cuzk.cz>
#'
#' @export
#' @md
silnice <- function() {
result <- .downloader("Silnice-D200-2021-07.rds")
result
}
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