Concretejim:
The purple one in the windscreen is also for austria, thats the emission class. Again routes at night time can only be used when having a E6 truck.Green sticker with the black 4 is germany, all vehicles need one when venturing into citys. Issued by dekra, again to do with emissions.
Smaller yellow circle is the French Critair, only required in Paris & Lyon at the moment I think but no doubt will get extended to other cities soon enough.
Green rectangular sticker is for the LEZ’s in Denmark.
Also registered for the LEZ in Antwerp but no sticker, it uses ANPR recognition.
Most of my jobs are city centre venues, hotels, exhibition centres etc hence a windscreen with more stickers than a Panini album 
