If you lived in NYC you would wear a helmet. Or should. And I would say NYC has more experienced cyclists than the Netherlands, considering what New Yorkers have to put up with. The dangers of NYC cycling is the density of things that can hurt you moving around you.
NYC has a population 10.40 times larger than the largest city in Netherlands (Amsterdam), with a density that is 7.85 times greater.
NYC has a population 10.40 times larger than the largest city in Netherlands (Amsterdam), with a density that is 7.85 times greater.
http://en.wikipedia.org/wiki/New_York_City
http://en.wikipedia.org/wiki/Amsterdam