1. Steg, L.: Can public transport compete with the private car? IATSS Res. 27(2), 27–35 (2003)
2. European Commission: Annual Accident Report 2017. European Road Safety Observatory. https://ec.europa.eu/transport/road_safety/sites/roadsafety/files/pdf/statistics/dacota/asr2017.pdf . Accessed 01 Mar 2018
3. The National Academies of Sciences, Engineering, and Medicine: Joint science academies’ Statement: Global response to climate change. http://nationalacademies.org/onpi/06072005.pdf . Accessed 01 Mar 2018
4. Umweltbundesamt: Treibhausgas-Emissionen in Deutschland. https://www.umweltbundesamt.de/daten/klima/treibhausgas-emissionen-in-deutschland . Accessed 01 Mar 2018
5. National Highway Traffic Safety Administration (NHTSA): National Motor Vehicle Crash Causation Survey. https://crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/811059 . Accessed 01 Mar 2018