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Global Technical Regulations (GTRs) - UNECE
Latest GTR 15 - Transport - Vehicle Regulations - UNECE Wiki
International: Light-duty: Worldwide Harmonized Light Vehicles Test ...
Chapter 14: The World Light Duty Test Procedure (GTR-15)
GTR 15: Proposal for Amendment 6 - globalautoregs.com
GTR 15 | TSI
Emission Test Cycles: WLTC - DieselNet