Euro emissions plates

electricspider:
I also saw whilst watching videos that on the interior side of the LEZ stickers there were various symbols, one being a 70kmh speed limit printed. Any help as to what they are for?

That’ll be the emissions sticker for the Mont Blanc and Frejus tunnels.

The reverse side shows the maximum speed of 70km/h and the minimum distance of 150m between vehicles in the tunnels.