Live Traffic Data for Germany not updated during trip

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Today I got stuck in a big traffic jam in Hamburg (Germany). While my car stood (for ca. 20 minutes), the road was shown in blue - no significant traffic. I canceled the route and set a new destination. Now the road in front of me turned immediately red.

I saw this behaviour on German Autobahn yesterday the other way around: the route shown for kilometers in red although the cars where free floating on that piece of the trip.

I guess, that live traffic data (under certain circumstances) is only fetched at time of initial route planning, but never updated.