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What is the TrafficModelID?

The traffic situation is changing all the time. In order to deliver traffic information that's consistent enough to use in multiple API calls, TomTom creates periodic "snapshots" of traffic. Calling your interfaces with the same traffic model ID ensures that the data is consistent for a whole screen full of tiles, or for a traffic tile and an incident list. You can obtain the current TrafficModel ID from the Traffic Icons and Viewport API calls.