Who pays more for roads, bikes or cars?

The facts are clear: People who don’t drive much — including most true bike zealots — significantly subsidize those who drive a lot. And in any kilometre-by-kilometre comparison of city residents who travel exclusively by one mode or the other, drivers tend to pay less than their real costs, while riders pay more.

via Bikes vs. cars: Who pays their fair share?.

Key point are these “real costs” since cars and car infrastructure cost cities far more than anything produce by and for cycles.