I don't know where Mikael got 15 Kph, but he would know. I suppose that might include all stops though, because that is a little slow for their cruising speed. For instance, the Copenhagen "green wave" in which all the lights are green if you bike a certain speed is set to work at about 20 kph (about 12 and a half mph). That seems to be the real speed that Copenhagen cyclists cruise about at, which is why the green wave is set that way and works.