The green sticker with the letter L (Lärmarm) comes from Austrian national regulations and indicates a vehicle with reduced noise. A vehicle marked in this way must comply with the tests established for vehicles in the engine power range with a noise value of up to 78 dB (A) for an engine up to 150 kW, and up to 80 dB (A) for an engine over 150 kW. Such a vehicle then has the right to an "L" marking and thus an exception to the ban on night driving in Austria, which applies from 10 p.m. to 5 a.m. for vehicles with a total weight of over 7.5 tons.
A sticker with a diameter of 150 mm is allowed to be placed on the vehicle if, due to insufficient space, it is not possible to use a sticker with a diameter of 220 mm.
