• Geluidonderzoek op vier trajectcontrole locaties

      Jabben J; Potma C; Lutter S; LVM (Rijksinstituut voor Volksgezondheid en Milieu RIVMV&W-RWS Adviesdienst Verkeer en VervoerV&W-RWS Dienst Weg en Waterbouw, 2008-07-10)
      The effects of the speed limit, introduced near the four major cities of the Netherlands in November 2005 remain under 1.5 dB. Along the A12 motorway at Voorburg (near The Hague) and the A20 motorway at Rotterdam, average noise levels decreased by 1.3 and 1.1 dBA respectively. Along the A10 motorway at Amsterdam an average decrease of 0.5 dBA was measured. No significant decrease in average noise levels was found along the A12 motorway at Utrecht. The cause of the smaller effect in Amsterdam and Utrecht is that here the comparative decrease of traffic speeds on the noisiest lanes is smaller. In Utrecht a larger noise reduction could be achieved if the speed limit on the main center lanes would also be set at 80 kilometer per hour. As compared to the average noise levels, the decline of hourly measured maximum noise levels was larger. At Voorburg and Rotterdam, the maximum noise levels declined by respectively 2.5 and 2.0 dBA. At Amsterdam and Utrecht the maximum noise levels were found to have decreased by 1 and 1.3 dBA. Inhabitants of nearby, adjacent dwellings, within fifty to hundred meters distance of the motorways may benefit from these decreased maxima and experience an improved acoustical quality of their surroundings. The stronger decreased maximum noise levels stem from a more steady and even distribution of traffic numbers and speeds. It is therefore possible that the maximum noise levels will also show a decrease at less tight speed limits, as long as steadiness and even traffic distribution are maintained.