I'm not sure what the other EU member states are doing. And I'm not sure what they will do with cars registered outside Germany. My guess is they will get an on-the-spot fine, just like they can for speeding etc. Because you have to follow the laws of the country you're driving in.
Someone also mentioned to me that the police will be taking it easy this winter by mainly giving warnings (unless you get stuck and block the road, or get into an accident). But next winter you can bet that they will be cracking down.
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