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This paper looks at the changes in the vehicle passby measurement techniques over the past decades and provides some insight to the problems faced in developing the technology as well as the product improvements. While all worked diligently to reach a product level, the methods were as varied as the participants. While the us epa started the charge to quieter vehicles the lack of public interest has decreased the us activity to minimal local enforcement. Few products are a major annoyance and little public concern will minimize future programs. World interest is significantly different and the interest of the governments to protect their population from noise polution is very high. This paper will also consider some of the differences that exist in the areas and the impact on noise annoyance.

Various SAE vehicle noise test subcommittees have been involved in numerous programs to improve and expand the applicability of procedures for increasing exterior noise levels and their relationship to the ever changing product lines. Parallel to this work, governmental and trade associations have also sought changes to better reflect the true measure of noise impact on the community. The evolution of testing has resulted in a continuing improvement in the quality of the test data. Benefits from the combined test programs have resulted in a significant improvement in the understanding of the test variability, statistical reliability, and applicability of these procedures. This paper will provide a compendium of the modifications that have evolved into the noise measurement procedures and practices in use today. The major emphasis will focus on passenger cars and light trucks.