And the alternative often is a traffic-slowed bus, or a crowded underground train traversing a highly walkable distance.

WSJ: Timing an Urban Stroll Isn't a Walk in the Park

On a recent day in a train station, commuter Alejandro Gonzales said that a million more people are now crowded onto the subways since Transantiago did away with many of the old bus routes.

NPR: In Chile, Commuters Sue City over Transit System

It started as a normal tube journey until large numbers of vociferous Millwall fans crowded onto the train, easily 50 in my carriage alone.

BBC: Unrest at Upton Park