There is a small bicycle revolution happening in BA. The government are building bike lanes all over the city and providing many stations where you can use them for free and then drop them off at another location. And aside from that, more and more people are buying and riding their own bikes as a clean, healthy and more enjoyable alternative to the chaos of public transport.
However, I think you need to be almost bat-sh%$ crazy to take to these congested streets on a bike, where the bus drivers basically use you as target practice and wouldn´t give way to you if their lives depended on it. And aside from this, nobody wears a helmut! But anyway, nice bike art... and some birds too.