Measured availability of the public API itself, probed once a minute. A minute in which the probe did not record a healthy response — including a minute in which nothing could be recorded at all — counts as unavailable.
Per-jurisdiction health across all 64 US and Canadian jurisdictions. This figure is the share of our fetches against upstream DOT feeds that succeeded over the last 7 days — it describes those upstream systems, not the availability of the Road511 API above.
Status data is generated from our source health monitoring and cached for up to 60 seconds. Worker heartbeat is refreshed every minute. For API-level questions or a historical-incidents request, contact [email protected].