Transportation and how one travels from one place to the next varies around the world. Whether it be taking the MUNI in SF or bicycling in Sweden, people (especially students) take the mode of transportation that is the most accessible. In fact, many areas rely on more public transportation and walking than driving like the USA.
Check out Milan Wilson’s post on cycle transportation: http://sfstateabroad.com/aarhus-denmark-cycle-transportation/ . Milan talks about the process of obtaining a bike in Denmark. The bicycle culture is especially popular in Scandinavian countries- there are even auctions that are held once a month! Be sure to also check other posts on transportation in Prague and France!