Traffic congestion is common among major cities. Congestion is usually due to too many vehicles on the road at any given time. One way of reducing traffic congestion is to encourage people to use non-motorize vehicles such as bicycles. However, when the number of bicycles is too many, a different set of problems arising such as inadequate number of bicycles' parking space and inadequate facilities for vehicles on the roadway. Such problems occur in Amsterdam where majority of city dwellers ride their bikes. Read Amsterdam clogged up by bikes for more information.