Section R926-4-4 - Procedure to Determine Functional Classification of Roads(1) The procedure the Department uses to determine the functional classification for roads will follow the concepts and procedures identified in the Functional Classification Manual and will meet the guidelines relating to the extent of road miles and vehicle miles traveled of rural and urban functional classification systems. The final system will be as reviewed and approved by the Federal Highway Administration.(2) Traffic volumes and road mileage will come from data the Department reports on an annual basis. Population information will be taken from the most recent U.S. Census information.Utah Admin. Code R926-4-4