Parameters Influencing the Noise Emission Levels from Passenger Cars in Urban Traffic

Noise Emission Levels From Passenger Cars - Past, Present and Future

“…In gure 3 we can see the cumulative distribution of two sets of data from gure 1 and 2: i -type approval measurements on 69 cars performed by the Norwegian Authorities in 1991/ 92 at the Gardennoen test track -type approval levels of 116cars(l989 models). supplied by a wide range of manufacturers, (4).…”

Technical assessment of the effect of regulations on road vehicle noise

“…Measuring Method The problems with the measuring method used for type testing of cars (corresponding to ISO 362) have been analyzed and explained [Biegstraaten & Tukker, 1982], where it is shown that a limit based on ISO 362 does not reject many of the "noisy" cars but rejects some "quiet" cars. The Dutch authors tested the effect of lowering the limit by 2 dB(A).…”