Roads with paving stones - Noise measurements

Four roads each with different types of paving stones in the Copenhagen area has been selected for noise measurements.One type of cement blocks as well as 3 types of granite blocks with different levels of surface "rough-ness".To achieve a less noisy type of paving stones a special type of granite blocks has been developed and tested.The best noise performance in this investigation was achieved by using flat concrete blocks or flat granite blocks.When using paving stones contra concrete or flat granite blocks the low frequency (vibration) noise is substantially increased.The difference between the noisiest and the quietest paving stone surfaces was 10 dB.