This is the kind of construction that is great if you can afford it. As a cyclist I would love it, as a taxpayer I am not sure I do: it is not cheap enough to be mass implemented, building one (or a handful) is then a marketing stunt. If I use the bicycle to go to work I have a dozen of heavy traffic intersections to cross, about 1/4 of the trip time I spend waiting for a green light, if one of these would be built there will be no significant change to the overall experience.