Approved Products List (APL) The Approved Product List (APL) is updated every month. The link will take you to the current list.  Additions to the APL for this month are shown in the Additions Table.  Please note that each month there are other changes to the APL besides the Additions. Changes to the APL are approved by the ADOT Product Evaluation Committees and are implemented by the first working day of the month following their action.  Please review FHWA memorandums and documents for product Category I, II, III, IV Certification requirements and approvals FHWA.  A copy of Report NCHRP 350 can also be found at the FHWA site. Documents are posted as they become available in PDF format, which requires Adobe Reader to view.