We're talking about kids here though, not all commuters.
And at least in the Netherlands, sample size of my office (around 300 people) maybe a dozen people max commute by car because they live ~2 hours away or in tiny villages where the trains are only hourly rather than every 10 minutes. I'd assume that metric varies a lot depending on the country you're looking at, and if we're talking about how kids go to school/practice/wherever, I'm willing to bet even in car-heavy European countries that the vast majority of kids take public transport or their bikes.
I have friends with kids in the (rural) North of the Netherlands, and their kid's school is ~15km away from their house. The kids bike that every day, to quote my friend, "they've got legs and wheels, why would I chauffeur them around?"
I’m not sure where Americans get the idea Europeans don’t commute by car.