As an innovative company, we are already dealing with the topics of tomorrow.

Study on future sound limit values for type approval for vehicles of category M & N

The reduction of sound emissions in road traffic is an important future topic for the automotive industry. The European Automobile Manufacturers’ Association (ACEA), which represents the interests of the vehicle manufacturers at EU level, supports this topic and tasked ATEEL to prepare a study regarding further limit reductions.

In detail, the objective of the study was to investigate the current vehicle sound emission levels of category M and N in order to evaluate the potential and the feasibility of limit value reductions in the UN Regulation No. 51. Furthermore, the translation of the limit value reductions in type approval conditions to real road traffic conditions was investigatedThe study intended to assess the efficiency of alternative measures and compare them to the ones achieved through limit value reductions in type approval testing.

The project was based on a combination of evaluation steps involving the analysis of a type approval database (provided by OICA/ACEA), a consultation with the vehicle and tyre industry as well as an impact analysis of various measures to reduce road traffic noise with an in-house developed calculation tool.

The duration of the project was from 01.10.2020 to 30.06.2021, with the presentation of the final study results at both 74th and 75th sessions of the Working Party on Noise and Tyres (GRBP) of the World Forum for Harmonization of Vehicle Regulations (WP.29).

If you are interested in the complete study, please feel free to download the free PDF-version below.

Final Report

Study on future sound limit values for type approval for vehicles of category M & N


Marcus Feld
Senior Expert Vehicle Certification