| Characteristic | Share of respondents |
|---|---|
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
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Source
Release date
September 2016
Region
Germany
Survey time period
2015
Number of respondents
227 respondents
Special properties
Experts from railway, bus and aviation companies, as well as universities and public authorities
Supplementary notes
The source does not specify the wording of the survey question.
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