I think this may work well in Portland, in the long run. The roadblock that I see in any "solution" that will change cyclist/motorist interaction on dual-use roads is the necessary critical mass of cyclist to change behavior. It seems to me that most of the solutions being proposed have been implemented and work well in Europe. European drivers have become conditioned to cyclist/motorist interaction. A similar conditioning is now BEGINNING to occur in Portland and the PDX metro area. Its going to take a change of behavior among both cyclists and motorists. Cyclists are going to have to stop acting like they're immune to traffic laws (lets face it, how many cyclists come to a complete stop at every traffic control device telling them to do so; its the law, we have to obey it if we're operating a vehicle). With more cyclists, motorists become more attentive. Don't know about where y'all live, but here in PDX the average motorist is not a homicidal maniac. They really don't want to kill us. It seems to me that bike lanes and bike boxes at intersection are a start. I'm really hoping we get more separated bike lanes and a better network of non-motor pathways. The biggest downside of my commute is getting stuck next to or behind a big vehicle with a diesel engine. Sucking down fumes is not good for us. I can't think of any reason not to get us out of traffic whenever possible.