|Overcrowding on São Paulo's metro|
There are so many people in central São Paulo it can get quite claustrophic at times. There are some places in particular which have a tendency to get overcrowded quickly. One of these is the platforms at most of the central metro stations.
The architects obviously already anticipated this problem and designed funnel shaped rails to make sure travellers are waiting at the right spot and are guided on to the trains quickly.
Things are not always very organised around here but these people funnels are very well observed, so well in fact, it almost looks like sheep herding>