Seattle Roadway Channelization Markings and Symbols for Traffic Safety

Channelization data from the City of Seattle's SDOT Transportation account represents roadway paint lines, curbs, and other markings delineating traffic lanes, bike routes, and bus zones. It consists of seven layers, including Vertical Elements, Lane Widths, Panel Markings, Longitudinal Markings, Transverse Markings, Legend and Symbols, and General Background. The data was last updated on March 22, 2026, and is dynamically updated via AutoCAD.

Use Cases

• Mapping traffic lane configurations based on longitudinal and transverse markings.
• Analyzing bike route and bus zone infrastructure from panel markings and symbols.
• Modeling pedestrian and vehicle safety using vertical elements and lane width data.
• Creating standardized map legends for transportation GIS based on the Legend and Symbols layer.

Strengths

• Data is structured into seven specific layers (e.g., Vertical Elements, Legend and Symbols) for detailed analysis.
• Maintained by the City of Seattle's SDOT Transportation account, suggesting official provenance.
• Dynamically updated via AutoCAD, indicating a link to authoritative engineering design files.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and dataset size are unknown, which may limit suitability assessment.
• Description metadata is limited; actual data quality requires manual inspection after download.

Provenance

Source

City of Seattle, SDOT Transportation account.

Collection Method

Common data layer created from a read-only view of a feature layer.

Time Range

null

Freshness

Dynamic via AutoCAD updates; last metadata update was 2026-03-22.

Geography

Likely City of Seattle, Washington, USA.