3.4.3.2.13 - pollution - road traffic noise pollution

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7 Terms

1

how is road traffic noise levels measured?

- LA10 measures noise exceeded for 10% in any set period

- good measure of the noisiest periods

- LA90 measures the noise level exceeded for 90% in any set period

- good measure of the quietest periods

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2

what is the Traffic Noise Index (TNI)?

this produces a representative measure of traffic noise using LA10 and LA90

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3

L10 (18h)

- measures assumes that traffic noise is only a problem between 6am and midnight

- noise level that is exceeded during the noisiest 10% of each of these 18 hours is measured

- the mean of these 18 levels is then calculated

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4

controlling wheel noise

sound absorbing road materials such as porous asphalt or asphalt that includes shredded rubber from old vehicle tyres

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5

controlling vehicle air turbulence

improved vehicle aerodynamics

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6

controlling engine noise

acoustic insulation around the engine to produce quieter exhaust pipes

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7

controlling general road vehicle noise

- traffic may be rerouted to avoid more sensitive (usually residential) areas

- traffic management to produce free flow of the traffic reduces the louder noise produced during acceleration

- fences, embankments, walls and dense tree planting can help to absorb noise around roads

- double glazing can reduce noise levels within buildings

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