Under the velid program, people can take a bicycle, use it for as long as they want, and then leave it at the same or another bicycle station. the first half hour on the bike is free, but if you don't return it after 30 minutes, you have to pay. But it's only 1 euro a day or 29 euro a year! The bicycles are heave, and they are all gray and have baskets. There are about 20000 of them in the city, and around 1450 bicycle station than 298 metro station.