Neighborhood Greenways
From the Portland.Gov web site:

Neighborhood greenways are low-traffic and low-speed streets where we give priority to people walking, bicycling, and rolling. Neighborhood greenways form the backbone of the city’s Safe Routes to School network and connect neighborhoods, parks, schools, and business districts. Portland has more than 100 miles of neighborhood greenways in every part of the city.
Learn about Neighborhood Greenways by watching this short video.
