1. External costs of transport: key concepts
   1.1 The concept of external costs
   1.2 Scope of external costs and level of externality
   1.3 Best practice methodologies
   1.4 Similarities and differences between modes of transport
   1.5 Overview
2. Congestion costs
   2.1 Methodological developments and new data sources
   2.2 Updated unit values for congestion costs
3. Accident costs
   3.1 Methodological developments and new data sources
   3.2 Updated unit accident costs
4. Air pollution costs
   4.1 Methodological developments and new data sources
   4.2 Updated unit values for air pollution costs
5. Noise costs
   5.1 Methodological developments and new data sources
   5.2 Updated unit values for noise costs
6. Climate change costs
   6.1 Methodological developments and new data sources
   6.2 Updated unit climate change costs
7. Costs of up- and downstream processes
   7.1 Methodological approach
8. Marginal infrastructure costs
   8.1 Methodological developments and new data sources
   8.2 Updated unit values for infrastructure costs