Validation of reference tyres and temperature correction for Close-ProXimity (CPX) method

In the ROSANNE project (acronym for "ROlling resistance, Skid resistance, ANd Noise Emission measurement standards for road surfaces") WorkPackage four deals with texture influence, reference tyres and surfaces. One objective is to study the performance of various reference tyres, to ascertain their reproducibility and stability over time. In the light of the ongoing writing of ISO/TS11819-3 regarding reference tyres, research was performed to fill up some gaps. CPX measurements were repeated with new P1 and H1 tyres at various kilometers run-in on 11 road surfaces to verify the influence of run-in. Additionally measurements were performed with three sets of P1 tyres on these 11 road surfaces to verify the reproducibility. Influence of mounting direction of new P1 tyres was verified on a porous mastic asphalt to supplement available research. WorkPackage two deals with measurement methods for noise emission properties. One task is temperature influence and correction. In the frame of the ongoing writing of ISO/TS13471-1 about temperature correction for CPX method, a measurement campaign was done on a poroelastic road surface. 24 measurements were performed with P1 tyre with air temperature range from 9 to 22 °C.