Citybike rents bicycles at public stations. Payment is by credit card, with a €1 registration fee. The first hour is free; the second is €1, third €2, and fourth €3. Bikes can be picked up or returned to any of the 110 locations around town. A flat fee for exceeding the time limit or loss of the bike is a hefty €600. Bicycle Rental Pedal Power offers a special service for tourists in which several bikes can be rented at the same time.