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Google Maps uses current and historical traffic trends to provide routes to drivers. In this paper, we use microscopic traffic simulation to quantify the improvements to both travel time and CO_2 emissions from Google Maps real-time navigation. A case study in Salt Lake City shows that Google Maps users are, on average, saving 1.7 we restrict to the users for which Google Maps finds a different route than their original route, the average savings are 3.4 12.5 during the Covid-19 pandemic. AsarXiv:2111.03426v1 fatcat:xpyccmfb7jeznn3bwztue4eami