Data was downloaded from this page: http://gis.dallascityhall.com/homepage/shapezip.htm . The actual file is http://gis.dallascityhall.com/homepage/Downloads/ShpZip/STREETS.ZIP
Coding sheet available here: http://gis.dallascityhall.com/homepage/Downloads/ShpZip/Dalroads_Fields.pdf
map <- rgdal::readOGR("../STREETS.shp", layer="STREETS") save(map, file="R/sysdata.rda", compress=TRUE)
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