Outer Sunset Orthogonal Grid
At a glance: Graded 22 out of 100 (Tier 1: Calm Grid & Orientation) across 3.4 miles in San Francisco Bay Area. Uniform 90-degree residential blocks, consistent sightlines, four-way stops, and low vertical relief across western San Francisco.
Why this corridor sits in Tier 1
Unlike San Francisco’s steep northeastern hills, the Outer Sunset follows a rectilinear coastal plain between Irving and Taraval streets. Geometric demand is governed by repetitive four-way stop intersections, light-rail transit islands on Judah and Taraval, and coastal marine fog transitions near 19th Avenue (SR-1).
Key roadway traits
- Consistent block spacing
- Minimal grade (< 3%)
- Clear crosswalk visibility
Four-factor geometric & crash decomposition
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Connected highway & local crash profiles
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Other Tier 1 California corridors
Methodology & interpretation limits
Complexity Index combines horizontal curvature, sustained elevation grade, speed-transition demand, and 12-month historical reported crash concentration per corridor mile. Counts describe observational public records unadjusted for daily traffic volume and do not represent driving safety advice. Missing-coordinate collision records in surrounding cities are reported separately in live buffered queries and are never plotted at synthetic coordinates.
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