When I've been in Munich, I've seen they have there dedicated lanes for bike traffic, which are not a part of general street and designed so that cars never go there - they are part of the same space as pedestrian walks but pedestrians are not supposed to walk there either - it is an exclusive bike space, with higher barriers for bigger danger (cars) and separation from lower danger (pedestrians). I think it works much better than what is here in California, where bicyclists share space on the road with cars. Each time I drive by a cyclist on the road, I can't help thinking how small mistake it would take - either from his/her side or from driver's side - for a tragedy to happen. That's why I am very reluctant to go on such shared spaces when I'm biking - I'd much prefer to have a space of a sidewalk than on a road.