Devices for road traffic noise reduction. Test method for determining acoustic performance. Part 5: Intrinsic characteristics. In situ values of acoustic reflection under direct field acoustic conditions

This technical specification outlines the methodology for evaluating the acoustic performance of devices designed to mitigate road traffic noise. Specifically, it addresses the assessment of inherent characteristics under field conditions, focusing on direct acoustic field parameters. The document establishes precise procedures for measuring reflection acoustic values when such noise control apparatus are deployed in real-world environments. It provides a standardized framework to ensure consistency and reliability in testing, allowing for comparable results across different locations and setups. The approach detailed herein is essential for verifying the effectiveness of noise reduction technologies in practice. By adhering to these protocols, stakeholders can accurately determine the sound reflection properties inherent to the devices without relying solely on laboratory simulations. The content covers specific measurement setups and data processing requirements necessary for a valid assessment of the device's behavior in its intended application area.