motorcycle noise is a potentially disturbing element of traffic noise but at present the numbers of these vehicles are too low to affect overall traffic noise levels as determined by indices such as l10 (18-hour)db(a). the greatest awareness of motorcycle noise occurs in situations where overall noise levels are low and where people are otherwise generally reasonably content with the traffic noise they are subjected to. further research is required to determine the noise emission from motorcycles during routine testing and under normal operating conditions in traffic.(a)

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