The SILVIA Guidance Manual on the implementation of low-noise road surfaces

Workshop: location and date

Information Network Information Network on QUiet Europeanon QUiet Europeanroad Surface road Surface TechnologyTechnology

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The SILVIA Guidance Manual

• The main output from the SILVIA project

• A summary of all of the key research and results from the project

• Written for the non-expert

• Freely downloadable from project website www.trl.co.uk/silvia

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Intended audience

• Highway Authorities

• Planning of traffic noise control measures

• Specification of the performance of surfaces

• Highway Contractors

• Meeting contract and product specifications

• Acoustic labelling of surface products

• Environmental Planners

• Improvement of noise predictions

• Development of Noise Action Plans

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Overview of contents

• PART 1: Background information

• PART 2: Overview of existing low-noise surfaces

• PART 3: Specifying the performance of low-noise surfaces

• PART 4: Quantifying the benefits of low-noise surfaces

• PART 5: The performance of low-noise surfaces

• PART 6: Advice on low-noise surfaces

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1: Background information

• The evaluation of noise An overview of the issues relating the physical measures used to describe noise with perception and annoyance

• Overview of vehicle and tyre/road noise A description of the various noise sources associated with vehicle noise emission and the important surface parameters necessary for the characterisation of a road surface

Equal Loudness Contours

Tread block slip

Block impact Block

snap-out

Driving direction

Air pumpingTread block slip

Block impact Block

snap-out

Driving direction

Air pumping

Tyre noise generation mechanisms

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2. Overview of existing surfaces

• Review of existing low-noise surfaces Overview of existing surfaces used in Europe

• Review of existing construction/ maintenance techniques An overview of available methods including cleaning & winter maintenance

• Prospects for further developments The opportunities for acoustic optimisation, structural durability improvement & new concept surfaces

Stone Mastic Asphalt (SMA)

Slip-form paver

3rd generation rollable surface

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3. Specifying the performance

• Overview of measurement methods: A summary of recognised methods used for obtaining measurement data and new methods developed within the project that are not yet recognised as standard. Certification procedures are also described

• Proposals for a noise classification procedure: The background to the SILVIA system and the procedures defined for acoustic labelling, conformity-of production assessment & routine monitoring

Measuring mechanical impedance

CPX measurement system

SPB measurement

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4. Quantifying the benefits

• Safety and sustainability benefits of low-noise road surfaces A summary of current knowledge on safety aspects and the effects of using the surfaces on factors such as water pollution, material use, recycling and fuel consumption

• Cost-benefit analysis Description of the application spreadsheet cost-benefit tool developed in the project

Rolling resistance trailer

Splash-spray on dense asphalt

Splash-spray on porous asphalt

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5. Performance of low-noise surfaces

• Factors affecting the performance of low-noise surfaces The influence of local conditions on surface performance, e.g. roadside developments, fleet composition, repairs and joints, weather effects, etc

• The integration of low-noise surfaces with other mitigation measures An overview of the influence of other types of noise mitigation measure on the performance of low-noise surfaces.

Noise Barriers

Traffic calming measures

Surface expansion joints

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6. Advice on low-noise surfaces

• Advice on the selection of low-noise surfaces Summary of the conclusions from the previous chapters of the manual and advice on other considerations, e.g. change in performance over lifetime

• Advice on the assessment of surfaces Summary of the procedures developed in SILVIA for COP assessment and routine monitoring

• Appendices: