If this is correct, all bikes are banned due to noise levels, even quiet ones. Not noisy cars though, they're ok! If I've got my bearings right, this includes the Smugglers Path out of Andorra and miles and miles of roads and trails... 
https://www.rideapart.com/news/659272/high-pyrenees-park-bans-motorcycles/.
https://www.rideapart.com/news/659272/high-pyrenees-park-bans-motorcycles/.
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