This is exactly what I have been doing over the last couple of months. However, I had not validated the accuracy of the journey times. I would quite often let the person at the other end of my journey know my ETA and - bingo - arrive at that exact time. Having used Google Maps for my own in-car navigation for a few years, I believe the predicted journey times are indeed very accurate.
Google does not provide much documentation on the actual accuracy of their journey times, so it often comes down to the potential user to test this for themselves. Testing the accuracy of Google Maps journey times
So, I decided to put Google Maps to the test to find out just how reliable it is. One question that always comes up is how accurate the journey times are. I have been doing quite a bit of work with businesses and government organisations on how to use Google Maps in real time and in particular the predictive Journey times and Estimated time of Arrival (ETA) functionality available through the Google Maps APIs.
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