The secondary evaluation on which this study is based is based on the results of "Mobility in Germany" and aims to identify factors and interrelationships in everyday passenger transport that contribute particularly strongly to CO2 emissions in order to identify starting points, make political measures more targeted and at the same time make the use of resources more efficient. For this purpose, the emission calculation model TREMOD (Transport Emission Model), version 6.03 (01/2020), is used on the one hand, and the data sets of the traffic survey "Mobility in Germany" of the survey years 2002, 2008 and 2017 on the other hand. Only CO2 emissions are considered in this study. Taking into account these specifications and definitions, TREMOD 6.03 was used to provide a list of specific emission values including upstream chain by vehicle type and means of transport in grams per passenger kilometer or per kilometer. Each reported route within the MiD is assigned a CO2 value based on this list, which is calculated by multiplying the transport-specific emission values by the length of the route. For this purpose, the data for the reference years 2002, 2008 and 2017 are used exclusively according to TREMOD 6.03. On this basis, precise emission calculations can be made on the basis of the traffic volume, since the CO2 emission values for each route include the corresponding distances and average load factors as information. With the described methods, differentiated analyses of the emission levels can now be carried out to identify the emission sources and causes. A distinction is made between three analytical perspectives: longitudinal analysis to compare the years of the survey and thus the development over time, a consideration of the route level and a cross-sectional analysis by person.
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