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MOTOR VEHICLES (STANDARDS) REGULATIONS - AUSTRALIAN VEHICLE STANDARDS RULES
147Visible emissions
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147 Visible emissions (1) This rule applies to a motor vehicle that is propelled by an internal combustion engine and was built after 1930. (2) The vehicle must not emit visible emissions for a continuous period of at least 10 seconds. (3) However, this rule does not apply to emissions that are visible only because of heat or the condensation of water vapour.