Uploaded on 2016-11-26 by Filip Doseděl

This photo is taken by me in Brno (Czech Republic) and shows a tram leaving the station. The tram is obviously the visible element but it contains also two invisible elements which are: 1/ The number of passengers travelling by this tram to the different destinations, because of different purposes, etc. 2/ The number of passangers who are travelling by this tram using season ticket, one-way ticket or eventually travelling as a stowaway. To the description I´ve chosen the element number 1 which may become a knowledge if it was observed for a period long enough to collect enough data about passengers´ travelling habits and according to this data the public transport department of the city can identify time intervals when they should provide more public transport vehicles in order to secure the fluent flows of passengers travelling to their final destinations as comfortable as possible.