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September 10, 2025

Determining correlation between various noise evaluation testing methods for passenger vehicles

Key Points

Statistical pass-by measurements showed a significant correlation with on-board sound intensity noise levels.
Results indicate that using multiple vehicle classifications enhances the robustness of noise evaluations in different pavements.
On-board sound intensity testing was standardized across various locations to ensure consistency in measurements.
This analysis has significant implications for simplifying noise testing processes at additional highway sites.

Abstract

As part of the NCHRP 15-68 project, "Effective Low-Noise Rumble Strips," off-strips noise was evaluated at multiple sites in California, Indiana, Michigan, and Washington. Each of these sites consisted of either older dense-grade asphalt concrete (DGAC) or chip seal pavements. On-board sound intensity (OBSI) testing was completed to establish the off-strips pavement level following the standard testing procedure with a full-size sedan. Additionally, statistical pass-by and vehicle interior noise measurements were made using multiple test vehicles from the following vehicle classifications: compact cars, full-size sedans, mid-size SUV, and full-frame SUV or pick-up truck. This paper compares the results of the different noise evaluation methods to determine potential correlation between OBSI, statistical pass-by, and interior measurements, which could be used to simplify highway noise testing at other sites

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