"Getting dedicated right-of-way for buses on the freeway is cheap: you just repaint the thing and make new signs. Maybe you build some fancy stations. It is incredibly cost-effective. The cost is so low that it isn’t mutually exclusive with rail, but it is politically difficult because of SOV interests. Unfortunately, BRT “advocates” spend all their time arguing with rail advocates telling them how to do their project better instead of doing the actual, necessary work of building a coalition to make this lane conversion happen."
-Martin H. Duke, "Bus vs. Rail Again," Seattle Transit Blog.