Please define functional classifications again. What is its importance?
The Functional Classification determines where the dollars from FHWA will go. Roadways are classified by roadway function; hierarchy goes from freeway to arterials to collectors to local. More information is available on FHWAs and ADOTs web sites and ADOT also has a book with descriptions available, please see http://mpd.azdot.gov/gis/fclass/index.php.