One of the things that impressed me about our trip (especially in Amsterdam) were how many bicycles there were and how many people used them as a daily means of transportation. In Amsterdam there were more bikes than cars. People were riding in everyday clothes, some with spiky heels. None of them had helmets. They probably didn't need them as drivers were very well aware of them.
The above picture is the bicycle parking garage at the train station for those who commute outside the city with the train and then ride their bike to work within the city.
You can tell who the Americans are. They're the ones with the helmets - that's us!