| From | To | Current | Typical | Delay |
|---|---|---|---|---|
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Segment speed, historical speed, and travel time come directly from the 511 SF Bay Traffic Segments API (~2 minute cache) — nothing here is predicted or derived. 511 does not measure volume or occupancy, so those fields are not shown. "Delay vs. typical" is simply each segment's current travel time compared to 511's own historical travel time for that segment.
Segments colored by delay vs. typical. Markers show the 3 real PeMS detector stations.
Bold lines: real 511 "current speed" per device (Upstream/Taper/Downstream), same colors as the map. Thin dotted lines: 511's own "historical" figure for the same devices — despite the name it updates in real time, unlike current speed on this stretch (see note below if flat). Drag to zoom into a range, scroll/pinch to zoom in place, shift+drag to pan, or use the slider to scrub point-by-point. Grows one point every ~2 min; not backfilled, starts empty on a fresh run.