Regulation 317 marks a pivotal transition in European emissions legislation. It formally introduces the standard, moving away from the temporary "Euro 6d TEMP" phase. The primary objective of this regulation is to close the gap between laboratory type-approval results and real-world emissions performance. It achieves this by tightening the conformity factors for Nitrogen Oxides ($NO_x$) and extending the operational window of RDE testing to ensure emissions control systems are active across a broader range of driving conditions.

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