Europe has some of the most bike-friendly cities on the globe, from Copenhagen and Berlin to Amsterdam and Barcelona. But cities elsewhere in the world have also caught onto the trend, like Portland and San Francisco in the U.S. and Kyoto and Singapore in Asia.

Bikes help cut down on traffic, congestion and harmful greenhouse gas emissions. They also lead to a healthier, more active society, and they’re much cheaper than a lot of other modes of transportation.

But what will the future look like when it comes to bikes and cars? Will we ever see a major metropolis completely dependent upon bikes and public transit? It’s hard to imagine that happening, especially in the world’s most densley-populated cities, where there is little infrastructure to support bike traffic. Still, we could see completely car-free urban centers in the future…only time will tell!