Transportation challenges seem intractable for all but a few cities that try hard to create an appropriate balance in the emphasis placed on the various modes of transport. In most cases the most maligned and ignored are cyclists,waiting in the shadows for an improved system to unleash their pedal power. And in most cases it will probably take bold initiatives to put things right. Like Copenhagen's superhighways that not only are direct, allow high speeds and overtaking, and give cyclists priority as they approach cross streets; they even borrow the traffic engineering concept of "green waves" so that if cyclists travel at the intended speed, they will approach signalised intersections when the signals are green for them. Bold, indeed.
And a bit more on the quirky side, here's an idea that may or may not be a good one but gets full points for innovation: a bike lane that isn't really a bike lane, but a temporary image of one, created by a bicycle-mounted laser system that projects a lane on the road surface that follows the cyclist wherever she goes, alerting other road users that they should leave a safe space around the cyclist.
While we're talking quirky, here's something that is neither practical nor green, but interesting if you're the kind of person who likes to soup up your wheels by strapping on a genuine jet engine and seeing where two wheels can take you.