The Arizona Department of Transportation Map Book samples the numerous uses made of ADOT’s base centerline file, commonly known as Arizona Transportation Information System (ATIS) Roads. ATIS Roads is a Geographic Information System (GIS) coverage, or layer, of Arizona roads and streets. The GIS community in the Arizona state government is a diverse group with a strong commitment to cooperative data sharing. Without this cooperative effort, many of the maps presented here could not have been produced.