Correct answer
Switch off the engine while waiting in those conditions.
Switch off the engine while waiting, as IDAE recommends for prolonged stops exceeding 60 seconds. This is an efficiency recommendation, not a universal rule to switch off at the same time in every situation. Follow the automatic stop-start system’s operation and manufacturer instructions. Tunnels or enclosed spaces also have specific engine-off duties.
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Always keep it running even when unnecessary.
Switch off the engine while waiting in those conditions.
Rev the engine in neutral to avoid idling.
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