The RFA's key functions are to:
- Manage the Road Fund, subject to Sections 16 (establishment of the Road Fund) and 17 (utilization of the Road Fund) of the RFA Act.
- Impose Road User Charges (RUC), determine the rates of those charges and collect those charges; subject to Section 19 (determination of Road User Charges) of the RFA Act.
- Determine the manner in which the funding collected will be allocated, subject to Section 20 (funding of Roads Authority and Approved Authorities) of the RFA Act.
- Implement appropriate measures for the effective monitoring of compliance by the Roads Authority with the Procedures Agreement and Approved Authorities with the conditions under which they were granted funding.