The 2025 Copenhagenize Index shows which cities have done the most—from redesigning streets to growing bike share systems and building bike storage—to make it easy to get around on two wheels. Over the last decade, dozens of cities have reshaped streets around cycling and slower, safer, healthier travel. Take Paris: at rush hour, boulevards that were once packed with cars are now filled with thousands of people on bikes, newly planted trees, and cleaner air.