slate.com asks... "should cities build more dedicated bike paths?"

Or, as Slate's headline calls them, "bicycle highways":

And while the words bicycle highway might conjure something like this image of a rather pathetic bike lane along a high speed motorway in the United Kingdom, those two words used together are actually gaining a certain currency. In Denmark, for example, the city of Copenhagen is extending its bicycling network outward into the suburbs, creating what the blog Copenhagenize calls "bicycle superhighways," for commutes of 10 kilometers or more, with everything from "green wave" lights (cycle 20 kilometers to hit all green) to standardized signage to bicycle service stations along the way. In London, Mayor Boris Johnson's own network of a dozen cycling "superhighways" is taking root.

U.S. cities like Portland and Rochester have recently been considering the idea, too.