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Effect of dynamic speed limits on noise : Test site A20 Rotterdam

Effect van dynamische maximumsnelheden op geluid : Proeflocatie A20 Rotterdam


The Centre for Transport and Navigation of Rijkswaterstaat wants to monitor the effects of dynamic control of speed limits (Dynamax) by conducting field tests on motorways.

At two pilot sites along the A12 in Voorburg and A20 in Rotterdam RIVM performs continuous noise measurements from which the influence of dynamic speed control on the noise emission from traffic is monitored. The Dynamax speed control means that the speed limit is increased from 80 to 100 km/h when traffic conditions allow this.

This report describes the results from the pilot site A20 in Rotterdam. After the introduction the Dynamax system (end of June 2011) an increase of Lden of 0.6 decibel was measured. One month later the road surface layer has been renewed. Therefore, measurements after the end of July have not been used in determining the noise effect of the Dynamax system. The new road surface reduces the noise by approximately 5 decibel with respect to the old one.

The measured noise growth over July 2011 can be attributed to the Dynamax speed control, though an uncertainty range is associated with this result because of the relatively short measurement period. Calculations of the Dynamax noise effect based on measured traffic intensity and speed show an increase of about 0.3 decibel.

The effect of the trial is probably in the range of 0.2-0.7 decibel. It is limited because the control system is only active on the north side of the road and because the speed limit is increased only at times when there is relatively little traffic.

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