A bicycle (or a fiets, as it is called in Dutch) is what many commonly associate with the Netherlands. And having lived here for almost a month, I can definitively affirm that these associations are grossly understated. Bicycles are used by everyone, and in the city they take the right of way over car, pedestrian, out-of-control biplane, everything. For perspective, the population of Utrecht is around 790,000 inhabitants. The number of bikes is around 880,000. Seriously. Utrecht Centraal, the train station, is currently underway in producing the largest bike garage known to mankind. This bike frenzy is so popular because of the city’s bike-friendly atmosphere coupled with the fact that the Netherlands is completely flat and, by bike, relatively traversal.
Here’s a little more bikey stuff: http://stuffdutchpeoplelike.com/2012/08/15/no-1-bicycles-bikes/