[throwaway894345]

> The original poster claimed that car usage is the norm in the Netherlands, which implies that anything else is outside the norm, or unusual

This isn't a reasonable interpretation. "the norm" only implies that it's the majority mode of transportation (in contrast with the anti-car rhetoric). This implies that other modes are not the majority, but it does not imply that those other modes are particularly rare.

> In a country that famously has more bikes then people, the idea that if half the bike journeys converted to cars there would only be a ten percent increase in traffic is quite clearly ridiculous.

I mean, I showed my math--feel free to point out where I erred, but just stating "it's quite clearly ridiculous" is like putting your fingers in your ears and shouting, "I can't hear you".