Correct answer
Yes, it is advisable.
Yes. IDAE recommends switching off the engine during prolonged stops as efficient-driving guidance. Do not switch it off while moving or compromise control, safety or required systems. Adapt the decision to the vehicle and follow its automatic stop-start instructions if fitted. Not every brief halt requires manually switching off the engine.
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It is prohibited to switch off the engine in traffic jams or congestion.
No, it is preferable not to do so.
Yes, it is advisable.
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