There are metro systems to suit all tastes. Dirty and uninviting ones like those in Rome and Atlanta, or clean and tidy like those in Singapore and Medellín. From the ubiquitous ones – take the Paris metro or the London tube – to the crowded systems of Buenos Aires and Tokyo (where helpers are famous for ‘gently’ pushing commuters with a cane to allow the doors to close).
Other students of sustainable mobility remind me that New York and Copenhagen serve as two of the most innovative systems. I couldn’t agree more: the former is the fundamental reason why Manhattan never became addicted to the car, the latter seems to have been specially designed to help cyclists move around both above and below ground.