passionate cyclist, and co-founder of rikulau international, one of the leading bike brands in asia, cheng-non hsu's focuses on making taipei a more environmentally-friendly city with bikes as transport. why are there so many bikes parked here? what is this station serving? it's national taiwan university, and there are 30,000 students here, so they come in and out, in and out. there's a big demand for bicycles here. tell me about the youbike system, because i understand it's quite a popular one; it's well used, very successful. very well used, very successful. the turnover rate is about 10 times a day. per bike? per bike. just for context, a bike being used five times per day is considered a really big success in a bike-share system, so ten times a day - that's ... i don't think i've ever heard of another city in the world where it's that high. in my opinion, it's all about the convenience. we have a very widespread metro system, and we have like two or three hundred youbike stations in the city. on average, every 400 or 500 metres, you have a station. so it becomes very, very convenient. you don't