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Do the Routing route calculations use real time or historic traffic information?

Depending on the call, it may use both. Real-time route calculations (where departAt=now, or where the default of now is assumed) will use real-time traffic information where it's available. Longer-term traffic information such as road closures will also be included where it is relevant. In addition, all routes planned use TomTom's IQ Routes database of historic traffic information for the day and time provided.