Portland streets are divided into different categories based on how much traffic they carry – which also determines the amount of wear and tear each street endures and types of repair needed.
Arterial streets have the highest volume of traffic and carry the majority of traffic entering, leaving, and moving across the city. This street type also carries mass transit and freight.
Collector streets "connect" local streets with arterials, with a higher volume of traffic than local streets. They may contain some bus and freight routes.
Local streets are neighborhood streets that are lightly-trafficked streets with low posted speed limits. These streets do not contain bus routes and may be part of the Neighborhood Greenway system. Two-thirds of Portlanders live on local streets.