The real magic of Google maps is that while you're using it, they're aggregating your position with others to make a real time map of traffic, and then aggregat

The real magic of Google maps is that while you're using it, they're aggregating your position with others to make a real time map of traffic, and then aggregating that over time for future predictions as well. Google maps gets better at predicting traffic as more people use it. This is generally true across mapping services.