BS EN ISO 11819-2. Acoustics. Measurement of the influence of road surfaces on traffic noise. Part 2. The close-proximity method Acoustic testing, Acoustic measurement, Traffic, Noise (environmental), Roads, Surfaces, Statistical methods of analysis, Comparative tests, Road transport, Sound intensity, Road vehicles, Commercial road vehicles, Weight (mass), Constant, Velocity, Classification systems, Age, Test equipment, Frequencies, Calibration, Temperature measurement, Siting, Guard rails, Sound insulation, Vehicles, Microphones, Accuracy, Testing conditions