Well, although I'm in favor of riding bike to work I'm not all the way against not taking bike to work too. Firstly, for people who walk, yes it takes a little more time but I surely thing it's a better form of cardio. Secondly, if you consider the roads, there is a little element of risk for riding a bike especially because there aren't enough bike lanes. And lastly, people could have physical conditions that could prevent them from cycling all the way to work.