> "
example: a report on the cost-benefit of using bicycles, that comes out with a fantastic positive number for introducing a cycle lane."
Rubber-stamp a multi-billion dollar highway widening project that won't reduce traffic*, no problem, doesn't deserve any comment. Bike lane? Scrutiny with a fine-tooth comb, subject it to years of studies, complain about the cost, complain about why anyone would want a bike lane - they must be up to something! The slider is jammed 98% over towards 'cars' and still the car drivers are like "Won't someone PLEASE think about the cars?!".
"No benefits for cars were mentioned as I recall" - seriously, you think everyone might have forgotten that cars exist in the twenty seconds between when they last saw one, or heard one, or had to wait to cross a road, or used one, or heard someone talk about one, or saw an advert for one? A study on bike benefits didn't say that cars were great, do you want a study on wheelchair accessibility to talk about the benefits of being able bodied?
> "I'm sure the health improvements exist, and it wouldn't surprise me that the health benefits to society were well estimated"
"Worldwide, we estimate that physical inactivity causes 6% (ranging from 3·2% in southeast Asia to 7·8% in the eastern Mediterranean region) of the burden of disease from coronary heart disease, 7% (3·9–9·6) of type 2 diabetes, 10% (5·6–14·1) of breast cancer, and 10% (5·7–13·8) of colon cancer. Inactivity causes 9% (range 5·1–12·5) of premature mortality, or more than 5·3 million of the 57 million deaths that occurred worldwide in 2008. If inactivity were not eliminated, but decreased instead by 10% or 25%, more than 533 000 and more than 1·3 million deaths, respectively, could be averted every year." - https://www.thelancet.com/journals/lancet/article/PIIS0140-6...
*roads are wider than they used to be; if adding lanes reduced traffic, there wouldn't be any traffic these days.