I like the idea of sharrows. I think the best bicycle facilities would be two or more same direction narrow lanes with sharrows giving the cyclist the entire right lane. Motorists could use that lane in the absence of cyclists, and it would give them another same direction lane in which to pass.
Sharrows increase cyclist awareness among motorists much more than do bike lanes.
Bike lanes tend to be placed far enough off to the side from a motorists intended path of travel to be easily disregarded.
Shares legitimize use of the roadway by bicycles in the eyes of motorists.
It appears to be fairly easy to incorporate bad or unsafe bike lane placement by incompetent design. This should be much less of a problem with sharrows.
Sharrows should be placed to give the cyclist the right 1/2-3/4 of the right lane depending on the width of the lane and other factors. This would give the motorist enough room to pass safely by simply changing lanes.
It has been my experience that a cyclist out in the roadway receives more consideration from motorists. Bike lanes tend to have the opposite effect by inviting closer and higher speed passing.
Sharrows should be mandated on all roads where cycling is legal. The only exception would be limited access highways. The higher the speed limit and more congested a given road, the more important that it have sharrows to raise motorist awareness and to indicate to motorists that cyclists may be present.