Predictive ETA
Recalculate all active trips
Recomputes worst-case blended ETAs for every active trip from gathered telemetry.
Look up ETA for a trip
Calculate ETA
Provide a base GPS ETA (required) plus any available source ETAs. The prediction takes the worst-case (latest) arrival and derives confidence from the number of sources (GPS / Historical / Traffic / Weather → Low / Medium / High).