ETA is calculated based on the average speed of vehicles on each road segment of your route, without traffic. The unit adds up the time for each road segment to get a total estimate of how long it will take. The average speed is based on industry standard known values that are part of the data in our devices. ETA is not based on the posted speed limit or the speed your vehicle is traveling. You can vary the ETA in the Tools > Info section on your device.
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