![](https://www.carfreewalks.org/images/content/an_ode_to_those_little_green_dashes_httpswww.carfreewalks.orgcmsimageswildflower.jpg)
They are found all across the country, weaving and intersecting in what often appear to be completely unplanned patterns. Some are ancient, some more recent; some have names, others are anonymous. Some are concrete highways, others are barely there at all.