Sometimes known as bike library systems, these bicycles may be lent
free of charge, for a refundable deposit, or for a small fee. A bicycle is
checked out to one person who will typically keep the bike for several
months, and is encouraged or obliged to lock it between uses. A
disadvantage of this system is a lower usage frequency, around three uses
per day on average as compared to 10 to 15 uses per day typically
experienced with other bike-sharing schemes