In 2000, the P llmann-Commission of the German federal government recommended a fundamental change in infrastructure financing of the German federal trunk roads. Instead of tax based investments, user pay principles should be pursued. Since January 2005, heavy goods vehicles are charged on German motorways. This book calculates the refunding demand of a public enterprise in charge of the German federal trunk road network. The infrastructure cost calculation methodology is based on the principles of the Life-Cycle-Cost-Analysis. Infrastructure costs are calculated for each constructive element separately (disaggregated approach). The approach distinguishes between the elements of road structure, tunnels, bridges, nodes, equipment, service areas, and maintenance depots. The total costs are allocated to user categories based on efficiency and fairness criteria (cost allocation). It is distinguished between proportionally attributed costs, system-specific costs, capacity-dependent costs, and weight-dependent costs. In a last step, the average tariff for heavy goods vehicles is differentiated based on emission categories and axle classes (toll differentiation).