roads function

Download a roads shapefile into R

From the Census Bureau: "The content of the all roads shapefile includes primary roads, secondary roads, local neighborhood roads, rural roads, city streets, vehicular trails (4WD), ramps, service drives, walkways, stairways, alleys, and private roads."

roads(state, county, year = NULL, ...)

Arguments

• state: A character vector of the two-digit FIPS code of the state of the county you'd like to download the roads for. Can also be state name or abbreviation (case-insensitive).
• county: A character vector of the three-digit FIPS code of the county you'd like the roads for. Can also be a county name.
• year: the data year; defaults to 2022
• ...: arguments to be passed to internal function load_tiger, which is not exported. See Additional Arguments.

Returns

an sf object with columns

• LINEARID: a unique line feature identifier (source)

• FULLNAME: display name (source)

• RTTYP: describes the types of roads used (source). Possible values are:

  • "C": county
  • "I": interstate
  • "M": common name
  • "O": other
  • "S": state regonized
  • "U": U.S.

• MTFCC: 5-digit geographic code assignment (see annual assignments)

Additional Arguments

Additional arguments that can be passed in ... are:

• class Desired class of return object: "sf" (the default) or "sp". sp classes should be considered deprecated as of tigris version 2.0, but legacy support is still available.

• progress_bar If set to FALSE, do not display download progress bar (helpful for R Markdown documents). Defaults to TRUE.

• keep_zipped_shapefile If set to TRUE, do not delete zipped shapefile (stored in temporary directory or TIGRIS_CACHE_DIR

  depending on the configuration of global option "tigris_use_cache"). Defaults to FALSE.

• refresh Whether to re-download cached shapefiles (TRUE or FALSE) . The default is either FALSE or the value of global option "tigris_refresh" if it is set. Specifying this argument will override the behavior set in "tigris_refresh" global option.

• filter_by Geometry used to filter the output returned by the function. Can be an sf object, an object of class bbox, or a length-4 vector of format c(xmin, ymin, xmax, ymax) that can be converted to a bbox. Geometries that intersect the input to filter_by will be returned.

Examples

## Not run:

library(tigris)
library(ggplot2)
library(ggthemes)

roads <- roads("Maine", "031")

gg <- ggplot()
gg <- gg + geom_sf(data = roads,
                   color="black", fill="white", size=0.25)
gg <- gg + theme_map()
gg
## End(Not run)

See Also

https://www2.census.gov/geo/pdfs/maps-data/data/tiger/tgrshp2020/TGRSHP2020_TechDoc.pdf

Other transportation functions: address_ranges(), primary_roads(), primary_secondary_roads(), rails()