What's nicer than cycling through the city, whizzing past shoppers, feeling the wind in your face as you slalom through streets? The Critical Mass movement is exactly that. It heralds the days of commuting solo, on wheels, using your own strength to get from A to B. Hamburg has a population of over 3 million people. With a bike you avoid the early morning rush-hour, the packed trains and the general stress of using public transport. On a bike, it’s just you and the road (and a few annoying robots) to your destination.