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 or Numeric. A numeric value >= 0 controls the degree of zoom. The default is 0.5.
cases
Character. Plot cases: NULL, "address" or "fatality".
distance.unit
Character. Unit of distance: "meter", "yard" or "native". "native" returns the map's native scale. See vignette("roads") for information on conversion.