Seattle Transportation GIS Data Collection

Over 60 transportation-related GIS datasets from the City of Seattle, covering categories like parking, transit, pedestrian, bicycle, and roadway assets. The collection includes annual traffic flow counts from 2007 to 2018 and detailed infrastructure layers such as bike racks, curb ramps, and traffic signals.

Use Cases

• Analyze annual Traffic Flow Counts data from 2007-2018 to model city-wide traffic volume trends.
• Map the locations of Bike Racks and Existing Bike Facilities to assess bicycle infrastructure coverage and plan expansions.
• Use Collisions and Crash data with Intersections layers to identify high-risk areas for pedestrian and vehicle safety interventions.
• Analyze Paid Area Curbspaces and Peak Hour Parking Restrictions data for urban parking management and policy planning.

Strengths

• Collection contains over 60 distinct GIS datasets on transportation topics.
• Includes 12 consecutive years of annual Traffic Flow Counts data (2007-2018).
• Covers a wide range of infrastructure types, from Bike Racks and Curb Ramps to Traffic Signals and Guardrails.

Limitations

• No row counts, column details, or sample data are provided for individual datasets, limiting upfront assessment of granularity.
• Data is provided as HTML links to an external portal, requiring additional steps to access and process the actual GIS files.
• The City of Seattle explicitly states it makes no representation or warranty as to the data's accuracy.

Provenance

Source

City of Seattle Department of Transportation (SDOT).

Collection Method

Published via the City's GIS Open Data website.

Time Range

Temporal coverage varies by dataset; traffic flow counts are available from 2007 to 2018.

Freshness

The metadata was last updated on 2025-01-31.

Geography

City of Seattle, Washington, USA.