NordTyre - Noise Reduction Potential in Nordic Countries by Introduction of EU Tyre Label

The NordTyre project was initiated to investigate the effects of EU tyre label regulation Reg (EC) No1222/2009 on labelling and tyre noise in the Nordic countries. 31 passenger car tyres was tested on 30 Nordic road surfaces in Denmark, Norway and Sweden using the CPX-method. A main result is a bad correlation between the measured noise levels and the noise labels of the tyres. The tyre label measurements is the Coast-By-method (CB), which differs from the CPX-method. Further 30 truck tyres was tested by the CB-method on four different pavements. The results of testing both passenger car and truck tyres shows that the noise performance on typical Nordic rougher SMA road surfaces is remarkably different compared to the smoother ISO test surface used for noise type approval. Based on these results noise scenarios of the effect of using a combination of less noisy tyres and road surfaces have been analysed on the background of the national noise mappings in Denmark and Norway. The results of the calculations show that there is a general noise reducing potential and an estimated potential to reduce the Number of Highly Annoyed from roads by 13 % in Denmark and 19 % in Norway.