![]() ![]() Russell went on to explain that navigation providers constantly compare their estimates to actual historical travel time in various traffic conditions to fine-tune their algorithms. They mix data from whichever sources they have, and come up with the best prediction they can make.” ”These things range from official speed limits and recommended speeds, likely speeds derived from road types, historical average speed data over certain time periods (sometimes just averages, sometimes at particular times of day), actual travel times from previous users, and real-time traffic information. “Like in similar products, Google maps ETAs are based on a variety of things, depending on the data available in a particular area,” former Google engineer Richard Russell wrote while answering a question on Quora earlier this year. While the exact science Google uses to calculate its projected arrival times remains a mystery to those outside the Maps team, a former Google engineer recently offered a good general explanation of how Google Maps calculates your ETA. ![]() Of course, some services are better than others at estimating your ETA and as is often the case when it comes to anything involving crunching large amounts of data with numerous variables, Google is better than most. The feature in most navigation apps that offers at estimated time of arrival is a nice add-on that gives drivers a general idea of when they might arrive at their destination. ![]()
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