I did a comparison of driving duration using Graphhopper and Google Maps Directions API. I compared about 4000 driving durations in Germany and found out that Graphhopper underestimates driving duration compared to Google ~20%.
Have you guys done any performance comparison on that side and checked how exact the calculated driving durations of Graphhopper are in reality?
Underestimated driving times is a known issue within cities and we are working on it.
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