The statutory power to levy tolls on national roads, to make toll bye-laws and to enter into toll agreements with private investors in respect of national roads is vested in the National Roads Authority (NRA) under Part V of the Roads Act 1993 (as amended by the Planning and Development Act 2000 and the Roads Act 2007). The contracts for the privately-operated toll schemes are commercial agreements between the NRA and the Public Private Partnership (PPP) concessionaires concerned. Two PPP contracts, the M3 Clonee-Kells PPP and the Limerick Tunnel PPP, incorporate a traffic guarantee mechanism. Noting the above position, I have referred the Deputy's question to the NRA for direct reply. Please advise my private office if you don't receive a reply within 10 working days.