Correct answer
By avoiding unnecessary engine revving.
Avoid unnecessary engine revving and use smooth inputs with a gear suited to conditions. Article 7.2 prohibits riding with an open exhaust or without an effective silencer on both urban and interurban roads. Missing a silencer affects noise; this alone does not establish that every modification necessarily increases pollutant gas emissions.
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By riding with an open exhaust.
By avoiding unnecessary engine revving.
By always using the lowest gear.
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