Character. A concatenation of a street's numeric ID, a whole number between 1 and 528, and a second number to identify the segment.
zoom
Logical. Default is FALSE.
radius
Numeric. Controls the degree of zoom. For values <= 5, the numeric ID of all cases or just the anchor case is plotted.
cases
Character. Plot cases: NULL, "anchors" or "all".
unit
Character. Unit of distance: "meter", "yard" or "native". "native" returns the map's native scale. See vignette("roads") for information on conversion.