CPX tyre/road noise measurements provide a useful means of assessing low noise surfacesand tyres, and the variation of noise along the length of a road surface. In this paper wepresent results of recent CPX tyre/road noise measurements undertaken with the ROADEARtrailer in and around Brisbane, Australia. Testing was performed over short (100 m)distances and long (5000m) distances. Simultaneous assessment of various road surfaceand tyre types was conducted using a range of surface types including chip seal, OGA,DGA, SMA & PCC and three tyres, including Type A and Type D candidate tyres, as wellas the Australian made (passenger car) tyre Bridgestone RE92. Most of the SMA and OGAsurfaces showed the lowest overall noise levels, although some of these road surfacesprovided relatively high emissions of noise. The Bridgestone RE92 tyre was found to besubstantially quieter than both the Continental Conti Eco Contact 3 (candidate Type Atyre) and BFGoodrich Mud-Terrain (candidate Type D tyre) for all road surface typestested. On average across all surfaces, the RE92 tyre was 3 dB(A) quieter than both theContinental and BFGoodrich tyres. Long distance measurements using the trailer showedconsiderable variability in concrete (PCC) and asphalt surfaces to the degree that sometransverse tyned PCC sections proved equal in overall noise level to the normally quieterasphalt (OGA & SMA) surfaces. This paper presents an assessment of these variations, andsuggests explanations for the results.
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