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

1. The SILVIA Guidance Manual on the implementation of low-noise road surfaces Workshop: location and date Information Network on QUiet European road Surface Technology

2. 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

3. 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

4. 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

5. 1: Background information Equal Loudness Contours Tyre noise generation mechanisms • 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

6. 2. Overview of existing surfaces Slip-form paver 3rd generation rollable surface • Review of existing low-noise surfacesOverview 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)

7. 3. Specifying the performance SPB measurement CPX measurement system Measuring mechanical impedance • 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

8. 4. Quantifying the benefits Splash-spray on dense asphalt Splash-spray on porous asphalt Rolling resistance trailer • 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

9. 5. Performance of low-noise surfaces Surface expansion joints Noise Barriers Traffic calming measures • 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.

10. 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: