When you go to Paris, you can see a lot of people riding grey bikes.Early there are was thousands of bikes available to rent on the streets of Paris.It was simple idea - you buy a cheap pass for a day or a week, pick up a bike on 'docking stations', ride it to your destination and then put it back.Now traffic is down, noise is down, pollution is down, parking is much easier and everyone from tourists to businessmen in suits get around the city on two wheels