Except they aren't building dedicated roadways -- they're just dedicating existing lanes. Look at the streetview link below. That lane with the red on it used

Except they aren't building dedicated roadways -- they're just dedicating existing lanes. Look at the streetview link below. That lane with the red on it used to be a regular traffic lane. This particular stretch of road becomes a nightmare during commute times, and it literally takes you four or five long traffic light cycles to get through this intersection. The bus used to sit in that, and now it whizzes past without noticing. That red lane is only a couple of blocks long, because this is the one really congested spot. You can't spot-apply rail like this. Not to mention, it's just paint -- they can study the effects of these optimizations and adjust them at relatively little cost. [1] https://www.google.com/maps/@47.6621364,-122.3451918,3a,75y,296.28h,78.81t/data=!3m6!1e1!3m4!1smebVUY4AYqKIq8rxSbNqSQ!2e0!7i13312!8i6656 https://www.google.com/maps/@47.6621364,-122.3451918,3a,75y,...