*5.3. Case Study Limitations*

It should be noted that the case study participants were located in four different cities, in three different European countries. In this study, it is not possible to see concrete behavior patterns in the evolution of the users from different countries, however it should be kept in mind that the cycling culture varies from country to country. Factors such as climate, infrastructures or terrain orography have an influence on the mode of transport chosen by citizens. It is also important to note that users have not travelled the same routes. Each user travelled different routes with different characteristics. For this reason, it is not possible to directly compare routes with others. The value of the heart rate sensor depends on the physical activities performed by the users. Those users who have performed activities that demand more physical activity, have higher HR values than users with simpler routes.
