Bike lanes may be the most cost effective way to improve public health, claims a new study from researchers at Columbia University’s Mailman School of Public Health.

Amazing things happen to a city once people are encouraged to switch to bike commuting: the air quality improves throughout the city, which benefits everyone, not just cyclists. Quieter roads are more pleasant roads to be around, and they're less congested for those who still insist on driving. And of course riding a bike every day brings all kinds of health benefits to the cyclists themselves.

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