Date: 23/09/2015
A mathematical study of transport in London and New York suggests the British capital should be wary of its trains travelling too quickly. If Tube journeys are too fast, relative to going by road, then the model predicts an increase in the overall level of congestion. This is because key locations outside the city centre, where people switch transport modes, become bottlenecks. By contrast, New York's layout is such that faster trains will always help.
External links
BBC News
A modelling study suggests that if London Underground trains travelled slower, there might be less overall congestion.