Here Mikael Colville-Andersen (author of Copenhagenize.com and Copenhagen Cycle Chic) talks about cycling and its infrastructure in Copenhagen, Denmark. Among other things he explains how the city got to the point of having 37% of trips made by bicycle, and how the city features a "green wave" for a certain bike lane - travelling at 20km/h a cyclist will get green lights all the way into the city.