GB/T 20243.2-2025 Active National standards

GB/T 20243.2-2025 Acoustics—Measurement of the influence of road surfaces on traffic noise—Part 2:The close-proximity method

Publish Date: 2025-02-28 Implement Date: 2025-09-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: GB/T 20243.2-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Acoustic metrology

ICS Name: Acoustics and acoustic measurement

Publish Date: 2025-02-28

Implement Date: 2025-09-01

Pages: 60 pages

Scope

This document specifies a method for evaluating the impact of different road surfaces on traffic noise under the predominance of tire/road noise. The method is applicable to free traffic flows traveling at a constant speed of not less than 40 km/h on flat roads, where tire/road noise plays a dominant role (on some roads with a large proportion of heavy vehicles, tire/road noise may not be dominant at a speed of 40 km/h). Under other non-free traffic conditions, such as at intersections, during rapid acceleration, in traffic congestion situations, on roads with large longitudinal slopes, and on roads with a large proportion of heavy vehicles, the impact of road surfaces on noise is more complex.
Standards for comparing road surface characteristics provide road and environmental management departments with a tool for establishing common norms or restrictions in aspects such as the management of road surfaces that meet noise limit standards. However, the establishment of such noise limit standards is beyond the scope of this document.
GB/T 20243.1 defines another method: the Statistical Pass-By Method (SPB). The Close-Proximity Method (CPX) described in this document shares the same purpose as the SPB, but constitutes a beneficial supplement to the SPB, such as: — Checking whether the road noise characteristics of the vast majority of locations meet the requirements of road surface specifications (an example of product conformity is given in Reference [1]); — Checking the acoustic impact of maintenance conditions, such as road surface wear and the clogging and cleaning effects of porous road surfaces; — Checking the lateral and longitudinal uniformity of road sections; — Developing low-noise road surfaces and studying the interaction between tires and road surfaces.
Note: This document does not describe the application conditions for measuring targets using the CPX method. Such conditions are specified in other standards and norms. How