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The Project Control Framework
This framework sets out how we, together with the Department for Transport, manage and deliver major road improvement projects.
Noise
Noise
The aim of the Scheme is to prevent any increase in noise wherever possible. Where this is not practicable then any increase in noise is limited, wherever possible, to 1 dB. It should be noted that noise changes of 1dB, either up or down, are not considered to be discernible to the human ear.
In the opening year of the Scheme, there is a reduction in the number of people that might be bothered by noise. This decrease is expected due to the provision of Low Noise Surfacing, which will be used on the full width of the carriageway. Currently, Low Noise Surfacing exists on approximately 40% of the Scheme, elsewhere Hot Rolled Asphalt or concrete still remains.
Existing Environmental Barriers along the motorway comprise 2 noise barriers located south of Junction 28 between Poplars Railway Bridge and Nags Head Lane overbridge. Both of these barriers will be retained as part of the scheme. No new noise barriers are proposed.
One property along the Scheme boundary are expected to receive significantly increased noise levels and qualify for Noise Insulation under Regulation 3 of the Noise Insulation Regulations 1975 (as amended 1988). This property is located at Wyngray Farm, St. Mary's Lane.
Noise Survey Method
The Environmental Statement contains indicative noise contours based on noise calculations at a grid of 21.9 yards (20 metres) by 21.9 yards (20 metres) at a height of 4.9 yards (4.5 metres) above local ground to equate to first floor windows. The contours represent free-field noise levels, i.e. they do not take account of facade reflection from individual properties.
The detailed noise calculations were generated using a 3-D computer model in accordance with the procedure given in Calculation of Road Traffic Noise published in 1988 by the Department of Environment.
This took account of:
- forecast 18-hour Average Annual Weekday Traffic (AAWT) traffic flows, including average speed and percentage of heavy vehicles;
- road configuration such as the gradient, cutting and embankment heights and the road surface;
- ground topography, including distance of receiver from the road, angle of view, ground absorption and any natural and purpose built noise barriers.
