For every kilometre driven by car, the Danish state pays out 16 cents.
Those numbers are from the “Socio-economic analyses of bicycle initiatives – methods and cases”, produced by COWI in 2009.
For a more local feel, if you ride in Copenhagen from Øster Allé to Nørreport during rush hour here’s the societal benefit and loss:
Bicycle: 63 cents net profit for society. (3.65 DKK)
Car: $1.15 net loss to society. (6.59 DKK)
So you can see that it has previously been important to reclaim some of the money that we’ve been throwing into a big, bottomless hole by subsidising car culture. It’s basic economics.
Worth noting that these numbers reflect the aforementioned taxes on cars in Denmark. I think I’d throw up a little bit in my mouth if someone could calculate the net loss in countries without such taxes.