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A vibrant Seattle through transportation excellence Interim Director, Goran Sparrman

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Street Classification Maps

Street Classification Map Insert Thumbnail ImageSeattle's street classification maps are now available on the web!

What is a street classification?

The City of Seattle classifies streets according to different levels of emphasis on traffic movement versus direct access to property. They are based on the American Association of State Highway and Transportation Officials (AASHTO) standards that identify major functional classifications for all urbanized areas that have over 50,000 people.

At one end of the hierarchy, a freeway emphasizes traffic movement while restricting access to adjacent land. At the other end of the hierarchy, a local street provides easy access to adjacent residential, commercial, and industrial land uses. Transportation improvements developed in accordance with the street classification system will help to discourage higher speed "through" traffic from using local neighborhood streets, and local traffic from congesting regional travel facilities. This will not only improve the efficiency of the transportation system, but will also maintain the livability of city neighborhoods.

The four classifications maps now available on the web are:

Planned Arterials: This map defines the arterial network and includes Principal, Minor and Collector arterials. In addition to the current arterial network, this map also indicates the city streets that are likely to become arterials in the future.

Seattle Planned Arterial Classifications Map:
High-Resolution Version, PDF format, 16.1 MB
Medium-Resolution Version, PDF format, 1.45 MB
Low-Resolution Version, PDF format, 825 KB
Legend Definitions - Planned Arterials Map, PDF format
Note on Accessing These PDF Files

Transit: This map defines a network of transit classifications that describe transit service levels on each street. The purpose of the transit classifications is to maintain and improve transit mobility and access compatible with the transportation infrastructure and surrounding land use.

Seattle Transit Classifications Map:
High-Resolution Version, PDF format, 13.2 MB
Medium-Resolution Version, PDF format, 2.8 MB
Low-Resolution Version, PDF format, 1.2 MB
Legend Definitions - Transit Map, PDF format
Note on Accessing These PDF Files

Trucks: This map defines a network of streets known as "major truck streets" that accommodate trucks in order to preserve and improve commercial transportation mobility and access.

Major Truck Street Classifications:
High-Resolution Version, PDF format, 12.8 MB
Medium-Resolution Version, PDF format, 1.24 MB
Low-Resolution Version, PDF format, 700 KB
Legend Definitions - Truck Map, PDF format
Note on Accessing These PDF Files

Boulevards: This map defines all streets that are part of the Olmsted Boulevard system. It also includes other streets that have design features consistent with a boulevard (e.g. abundant landscaping, medians).

Seattle Boulevard Classification Map:
High-Resolution Version, PDF format, 12.8 MB
Medium-Resolution Version, PDF format, 1.27 MB
Low-Resolution Version, PDF format, 750 KB
Legend Definitions - Boulevard Map, PDF format

Note on Accessing These PDF Files

The high resolution version is good for printing. We recommend printing the map at 11 x 17 size for best printed quality. If you right-click your mouse on the file link, then choose "Save Target As" you can save the file directly to your computer's hard drive or network folder.

If you choose to open the high resolution maps with your browser, you may experience a wait for these large files to open, and, after they are open, as you scroll down the map, it may seem as if the map is blank; you will need to wait each time you scroll through sections of the map so it has time to load on your computer screen.

The low and medium resolution versions are good for quicker online viewing. When you have accessed these files, try setting your Acrobat Reader's Zoom function to between 100% and 200% to see clearer map details.

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