Weather data and official road-information sources

Forecast data

Website corridor forecasts are provided by Open-Meteo. Published route pages identify the representative locations used for each corridor and show the forecast update time when live data is available.

Open-Meteo weather API

Official road authorities

Route pages link directly to the relevant state, provincial, or national road authority. Depending on the route, examples include 511 systems, transportation departments, DriveTexas, Caltrans QuickMap, Ontario 511, Quebec 511, and DriveBC.

FHWA traveler informationOntario 511Quebec 511DriveBC

Source and update policy

Live forecast snapshots include their generated time and are refreshed by the browser when a route page opens. Static route guidance changes only when corridor research, source links, or product methodology changes. A forecast timestamp should never be interpreted as a road-condition verification time.