Only a comment for MOG42 --> the green sticker does not mean EURO4, but only class 4 which get all cars with petrol engine and cat.
Only old Diesel cars do get only a yellow or red sticker with class 3 or 2, which does allow you to enter the cities.
But the 3W is homologated as motorcycle, so the green sticker is not necessary to enter the cities, only cars need the green sticker, motorcycles don't.
