HERE BELOW ARE ALL THE SOURCES I USED FOR S2:
- http://youcanbikethere.com/environmentalbenefits/
- https://www.mdanderson.org/publications/focused-on-health/May2016/health-benefits-cycling.html
- http://bikeleague.org/sites/default/files/Bicycling_and_the_Economy-Econ_Impact_Studies_web.pdf
- https://www.bicyclenetwork.com.au/general/policy-and-campaigns/2792/
- http://www.tmr.qld.gov.au/Travel-and-transport/Cycling/Benefits