They concluded that while every kilometre costs €0.50 to drive, it only costs €0.08 to cycle.
"In many cities of the world, bicycle infrastructure projects are implemented to foster more sustainable transportation systems", said Gössling. "However, such projects have often raised questions regarding their public funding, as they entail considerable costs".
"The cost-benefit analysis in Copenhagen shows that investments in cycling infrastructure and bike-friendly policies are economically sustainable and give high returns."
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Slight pity it's in the 'men's section' of the paper - with a photo of male commuters!