There are good examples of open data collection in cities today. One example is the bicycle counters (cykelbarometer) in Copenhagen, which use a sensor line in the bike lanes to count each bike that passes by. A display shows the number of bicycles for the day and for the year. And because Copenhagen is dedicated to being kind to cyclists, the cykelbarometer includes an air pump for bicycle tires. This simple yet effective way to engages the public in data collection.