Noise Monitoring Trailer

Travelling far distances, along open highways can be tiresome, particularly with constant unforgiving noises coming from the road.  The mechanical interaction between the tread of moving tyres and the characteristics of a road’s surface can create noises intolerable to drivers, their passengers and surrounding communities.

Vipac’s acoustic engineers work with tyre manufacturers, road authorities and suppliers of pavement materials to assess the conditions of public roads using an innovative monitoring system, known as a Noise Monitoring Trailer.

Noise Monitoring Trailer Image

Vipac uses its unique Noise Monitoring Trailer to assess the acoustic characteristics of road surfaces.

Vipac’s Capabilities

Our acoustic engineers have extensive experience in monitoring and assessing the condition of different road surfaces for the purposes of maintenance, research and development (R&D). Our state of the art Noise Monitoring Trailer is the only enclosed trailer available in Australia with ISO certification

What is a Noise Monitoring Trailer?

 Our Noise Monitoring Trailer measures the sound intensity for tyre and/or road noise on public roads, in particular highways and freeways.

Built and certified in accordance with ISO 11819-2: OPX and AASHTO TP 76-12: OBSI methods, the trailer includes the following features;

  • An enclosed ‘test wheel’, which; minimises traffic noises and enables testing without having to close the road; can test standard passenger tyres (e.g. sedan) to commercial tyres (e.g. truck)
  • GPS satellite, to provide exact locations on the test road
  • Speedometer, to provide accurate speed of vehicle
  • Thermometer, to provide precise readings of air temperature
  • Real Time Data Acquisition Unit to record sound information
  • Instant onsite processing and graphical presentation of results from each of the individual readings (e.g. GPS locations, tyre type, vehicle speed and sound levels)


 Vipac’s Noise Monitoring Trailer is the only enclosed trailer which tests the acoustics of road surfaces in Australia with ISO certification. Our trailer meets the following standards;

  • ISO/TS13471-1 Acoustics – Temperature influence on tyre/road noise measurements; Part 1: Correction for temperature when testing with the CPX method
  • ISO 11819-2 Acoustics – Measurement of the influence of road surfaces on traffic noise; Part 2: The close-proximity method
  • ISO/TS 11819-3 Acoustics – Measurement of the influence of road surfaces on traffic noise; Part 3: Reference tyres
  • Standard Method of test for Measurement of tyre/pavement noise using the on-board sound intensity (OVSI) method; AASHTO Designation : TP 76-13

What does the Noise Monitoring Trailer test?

 The Noise Monitoring Trailer is used as a pavement evaluation tool to measure or assess;

  • Characteristics or conditions of an existing pavement/road structure and functionality.
  • Performance durability of a road surface to support current and future traffic loadings.
  • Acoustic consistency of a road’s surface.
  • Noise levels and whether they are acceptable or whether intervention is required to ensure a safe, smooth and quiet driving surface.
  • The aging effects on road surfaces, including areas which require maintenance, preservation and/or rehabilitation.
  • Mitigation measures have corrected the road surface and its performance.
  • Future conditions of a pavement/road, with or without the application of treatments.
  • Changes in road surfaces at different times of the day and at different temperatures.
  • Hardiness of tyres on different road surfaces.

Vipac measures whether the noise levels from road surfaces are tolerable for drivers, passengers and surrounding communities.

Vipac’s Benefits

The Noise Monitoring Trailer provides many benefits, including the ability to;

  • Assess road surfaces’ acoustic properties at a wide range of sites and surface materials (e.g. bitumen, concrete, gravel).
  • Test different highway pavements, mainly on dominant, high speed surfaces.
  • Assist pavement surface suppliers with Research and Development (R&D) by providing information on the performance of their materials and the effect the tyres’ weight has on them.
  • Provide comprehensive databases to assist road authorities in developing the most cost effective and appropriate strategies for road resurfacing and modifications to highways.
  • Assist road authorities in prioritising projects, allocating budgets and determining funding needs for highways and other road surfaces.
  • Provide tyre manufacturers with a noise rating (dB) of their tyres, together with comparative data on how different tyres perform on different pavement surfaces.

For explanation of Acoustic terms please see Acoustic Glossary.