Work out eta arrival time instantly with clear inputs, formula shown and shareable results.
Estimated arrival is departure plus distance over speed plus expected delays. Showing the delay-free arrival alongside makes the cost of congestion explicit, and using the modulo of 24 handles journeys that cross midnight.
ETA
arrival = departure + distance / average speed + delays
They assume free-flowing traffic at the posted limit unless live data says otherwise, and they cannot predict your break stops.
Plan on the delayed figure and communicate that. Arriving early is always easier to handle than arriving late.