1. 1) U. Sandberg, ``Noise emissions of road vehicles effect of regulations: Final report 01-1 by I-INCE working party on noise emissions of road vehicles,'' Noise News Int., 9, 147-203 (2001).
2. 2) Y. Oshino, T. Mikami, H. Ohnishi and H. Tachibana, ``Investigation into road vehicle noise reduction by drainage asphalt pavement,'' J. Acoust. Soc. Jpn. (E), 20, 75-84 (1999).
3. 3) K. Tsukui, Y. Oshino, G. Blokland and H. Tachibana, ``Study of the road traffic noise prediction method applicable to low-noise road surfaces,'' Acoust. Soc. & Tech., 31, 102-111 (2010).
4. 4) S. Sakamoto, ``Road traffic noise prediction model ``ASJ RTN-Model 2013'': Report of the Research Committee on Road Traffic Noise,'' Acoust. Soc. & Tech., 36, 49-108 (2015).
5. 5) Research Committee of Road Traffic Noise in Acoustical Society of Japan, ``ASJ Prediction Model 1998 for Road Traffic Noise: Report from Research Committee of Road Traffic Noise in Acoustical Society of Japan,'' J. Acoust. Soc. Jpn. (J), 55, 281-324 (1999) (in Japanese).