(Photos by J.Maus and M.Andersen/BikePortland)
If Portland has contributed any innovations of its own to the craft of designing great streets, it's this two-word idea: neighborhood greenways.
A remix of ideas from Utrecht and Vancouver BC, these low-cost retrofits of low-traffic side streets — adding speed humps, sharrow markings, traffic diverters and signalized crossings of big arterials — have taken the national bike world by storm since Portland's Greg Raisman and Mark Lear developed the concept in 2008 or so. In 2010, a citywide network of greenways became the first priority to emerge from Portland's landmark 25-year bike plan.
The concept went viral.