Traffic Noise Overlay

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Traffic Noise overlay

The Traffic Noise Overlay is a Grid Overlay which computes the amount of noise in dB(A) for any given location in the project. The calculation takes into account traffic intensities and a number of environmental- and computation parameters to compute the noise impact. It also takes into account Buildings and terrain features which would block the transmission of noise.

The Overlay only computes noise from traffic. Although a background noise level can be configured, other sources of noise (such as windmills, air traffic, or factories) are explicitly excluded.

Traffic Noise Model


Main article: Model attributes (Traffic Noise Overlay)

The Traffic Noise Overlay has a number of options which allow it to be configured as desired. A configuration wizard is available.

The following aspects can be configured:

  • Reference speed per vehicle type
  • Noise and noise multipliers per vehicle type
  • Background noise
  • The hour(s) of the day to perform the calculation for


Traffic intensities for each type of traffic can be based on one of the following:

The traffic intensities can be defined as either a single value or as 24 hours, with each value corresponding to each hour of the day. The intensity used for the calculation is then defined by the HOURS model Attribute.


Main article: Traffic noise formula (Traffic Noise Overlay)

The Traffic Noise Overlay performs its calculations based on the Overlay's Attributes, and the Attributes of roads present in the project. The calculations follow the standard rekenmethode 1 (SRM 1)[1].


The following result types are available as output from the traffic noise calculations:


  • The Overlay calculations are based on Standard Calculation Method 1 (SRM1) as defined by the dutch government.[1].



  1. 1.0 1.1 SRM1 ∙ Reken- en meetvoorschrift geluid 2012, Bijlage III ∙ Found at: ∙ (last visited: 12-02-2022)