Thank you for all the contributions and to our moderators! Here are my answers to questions 2, 3 and 4. I will get to questions 5 and 6 in the next few days.
2. Are there examples of concrete measures promoted by local authorities to recognize and increase such kind of link?
I am unaware of concrete measures but there may well be some examples. The National Association of Street Vendors of India (NASVI) as well as other organizations such as the Cebut City United Vendors Association (which I documented for FAO at: http://www.fao.org/3/a-y1931m/y1931m05.htm) may have information on this.
3. If so, how have these actions influenced consumers’ choices towards street food?
Unknown to me.
4. Have similar initiatives been prompted directly by street food vendors associations? How?
As above. Unknown to me.