The term user financing describes a sustainable financing concept for transport infrastructure. In contrast to tax financing, the road user pays directly to use the infrastructure. An efficient infrastructure is provided in return for the price paid. The principle of services rendered and services received - the so-called principle of equivalence - is indispensable for the system of user financing. The provision of services and their use therefore form a funding cycle that reflects the actual road costs and where the supply is based on the demand.