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1.3 Construction Traffic Predictions


1.3.1 Prediction Method Increases in traffic noise as a result of construction traffic have been calculated using prediction methodology within the Calculation of Road Traffic Noise (CRTN). CRTN incorporates total vehicle flows, speed, HGV % to predict noise levels at receptor locations 10 metres from the roadside.


1.3.2 Prediction parameters


The following parameters have been used when calculating noise levels at receptor locations from construction traffic:


• Noise levels predicted to 10 metres from roadside. Assessment is based on a comparison of baseline and baseline + construction traffic and therefore different distances from road to receptors will not the affect outcome of assessment.


• For the speed of traffic used in predictions, the speed limit on individual roads has been applied to a maximum of 55 mph for the baseline and the baseline + construction scenarios. The lower the speed the lower the predicted noise level. However, this limit would only apply to HGV traffic. Utilising this reduced speed for existing total traffic presents an underestimation of the baseline total noise levels. As the predicted increase in construction traffic is largely HGV, this approach is considered a conservative method.


1.3.3 Assessment Results


Table 1 presents a full listing of the traffic used within the predictions and the calculation process. A Summary of the results in Table 1 is presented in Volume 3, Chapter 26 of the Environmental Statement.


EAOW


Noise Prediction Methodology P41388


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