In the future mobile phones could subtly change city infrastructure, wrote John Metcalfe:

• Pedestrians who text and walk at the same time have a tendency to get hit by cars or run over by trains.
• One German city is embedding pedestrian lights into the roads around a train station. The hope is that texters while looking down at their phones will also see the red lights that indicate an oncoming locomotive.
• Critics of the idea say that you cannot “protect against…idiots”.

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Source: City Lab