J Acoustic Report · 132007.2398

                                                                                          ACOUSTICS & AIR QUALITY

6     Road Traffic Noise Assessment

6.1       Overview

Road traffic noise has been assessed from Cooroy Connection Road (Elm Street) onto the
proposed development. The relevant assessment criteria are outlined in Section 4.2.2.
TMR recommends that the prediction of road traffic noise is to be conducted according to the
United Kingdom Department of Transport (1988) procedure published as ”Calculation of Road
Traffic Noise” (CoRTN88). The road traffic noise levels have been predicted using the PEN3D
computer model, based on the CoRTN88 traffic noise prediction method and is approved by
TMR.


6.2       Data

The following data has been used in the noise calculations:
          Noise source height of 0.5 m.
          Ground contours for the site obtained from the Client onsite survey, field observations,
           and Google Earth Pro.
          It is understood that all residential dwellings will be single storey, and therefore a
           receiver height of 1.8m above the provided pad levels has been used in the noise model.
          Road width as per site inspection and Google Earth Pro images.
          Traffic data shown in Table 6.1 has been obtained from TMR for Year 2012, and has
           been adjusted for the years 2014 (existing) and 2024 (ten year planning horizon) using
           a standard growth rate of 3.5% per annum.
          The 18-hour traffic flow is taken to be 94% of the ultimate daily traffic flow.
          The road surface for the roads is unknown but has been modelled as dense graded
           asphalt (DGA) for validation purposes.
          TMR CoRTN correction values of -0.7 dBA for free-field predictions and -1.7 for facade
           corrected predictions have been used.
          A +2.5 dBA facade reflection allowance is included in the road traffic noise level
           predictions.


Table 6.1 Road Traffic Noise Data for Traffic Modelling

          Road               Traffic Volume (AADT)            Speed (km/h)      Percentage Heavy
                                                                                 Vehicles (%HV)
                         2012       Existing     Future
                                     2014        2024
     Cooroy              6455        6915         9754         60/80/100                5.5
Connection Road
  (Elm Street)



6.3       Verification

The results of the noise survey carried out at Location A have been used to verify the road traffic
noise model of Cooroy Connection Road (Elm Street).




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