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3.
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Regulation No. 51 (Noise of M and N categories of vehicles)
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3. (a)
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Development
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3. (b)
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New limit values
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3. (c)
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Additional sound emission provisions
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7. (a)
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Regulations Nos. 41, 51 and 59
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7. (d)
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Proposal for amendments to Regulations Nos. 28, 51, 59 and 117
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