Well the one I'm thinking of they've taken a four lane gun barrel, created a path on each side, added on/off turn lanes and created a single drive lane for each direction. Normally that would sound terrible, but it's through a residential part of town albeit one of the main roads through town. Hit it spot on they did, traffic has slowed considerably. It used to be a terrible place for the kids to walk home from school, as there are schools all over the place within a block or two of this street. The path isn't a great design for riding..but as a calmer of cars?, BINGO.