Proposal to further harmonize test procedures for two-wheeled vehicles equipped with conventional combustion engine technology, including restructuring to dedicate separate sections to test types I (tailpipe emission after cold start), II (idle / free acceleration emissions) and VII (energy efficiency). The amendment aligns the GTR with technological progress, including changes related to

1. reference fuels
2. temperature conversion
3. forced induction systems (turbo/super-chargers)
4. treatment of open/closed systems
5. test room humidity
6. CO₂ tolerance, and
7. reference mass of the vehicle.