In London they have built some amazing cycle super highways which are great to cycle on, however you can go incredibly fast and some people do - I've seen three ambulances in a week along there (Embankment) recently scraping up people off the road. It's safer than being with cars and lorries but pedestrians seem to not look and walk into the cycle lane because bikes are pretty silent... anyway I do agree with cycle lanes but maybe we need to think through pedestrians and speed as well...