≡ Roads checking…
Road conditions
Roads Road incidents are events. Road conditions are not.
no key required CORS-open
Place scopes every section below · incidents arrive through
/events?layer=road_incident; conditions are projections of live
state, served only as the road_segment and
chain_control map layers
Incidents severity · headline · id What this is
CHP and Caltrans incidents on these corridors, each AI-enhanced into a readable
summary with an impact-driven severity.
These are stored events — the same records
/events?layer=road_incident returns — so a row opens the
full record and its revision history.
Road segments GET …/map/road_segment.geojsonroad · status · congestion · travel · delay · distance What this is
One row per monitored road, live from Google Routes travel times and Caltrans status.
Delay is against the road's free-flow duration; status is AI-determined, with the
explanation shown when a road is not fully open.
A segment is baseline state — it never appears in
/events.
Chain control GET …/map/chain_control.geojsonlevel · highway · direction · note What this is
Active chain requirements from Caltrans — R1 chains or 4WD · R2 chains except 4WD ·
R3 chains required, all vehicles.
Empty is a clean report
It means the source reported no controls — not a failed feed. A failed feed says
UNAVAILABLE in the source block above.
To read those two condition layers as geometry — with their
metadata block beside the map — use the
Map screen.