Toll_Operate_and_Transfer (TOT) model under which the Publicly funded projects operational for two years shall be put to bid wherein the right of collection and appropriation of the fee shall be assigned for a predetermined concession period (30 years) to Concessionaires (Developers/Investors) against upfront payment of a lump sum amount to NHAI. Operation and Maintenance (O&M) obligation of such projects shall be with the concessionaire until the completion of the concession period. Projects to be undertaken in the TOT model are to be treated as Public-private-partnership (PPP) projects.