Would you like to ride on Rivertrail but don't have a bicycle? No problem, just help yourself. There is no charge to borrow one, just swipe a credit card and the rack will release one for you. The catch is that if it is not returned in 24 hours you get charged $100. Not a bad deal if you want to pay $100 for a pink sidewalk bike, although I'm not sure you would get to keep it. It just keeps people honest.