1. World Health Organization, http://www.who.int/
2. Sierpiński, G., Staniek, M., Celiński, I., Czech, P., Barcik, J.: Identification of pedestrian travel in modeling of modal split and transport accessibility. In: 12th Scientific and Technical Conference Transport Systems Theory and Practice, pp. 46. Faculty of Transport, Silesian University of Technology, Katowice (2015)
3. Zadrożny, P.: Accessible Public Transport. Foundation of Institute for Regional Development, Kraków (2009)
4. The European Economic Commission of the United Nations: Regulation No 107. Uniform Provisions Concerning the Approval of Category M2 and M3 with Regard to their General Construction. The Official Journal of the European Union L 255. New York (2010)
5. Brzeziński, A., Dobrosielski, M., Dybicz, T.: Organization of the Streets in Downtown Areas. Guide. The Ministry of Infrastructure and Development, Warszawa (2013)