| GTR No. 15 WLTP | Worldwide Harmonized Light Vehicle Emissions Test Procedure | Worldwide Harmonized Light Vehicles Test Procedure <p>This GTR prescribes a test cycle and test procedures to measure the emissions (including off-cycle) and fuel efficiency of light-duty vehicles. The GTR was adopted at the March 2014 session of the World Forum.</p> <p>A supplemental "phase 1b" is underway to refine certain elements of the initial regulation. WP.29/AC.3 expects to consider a proposal for Amend. 1 to UN GTR No. 15 in November 2016 as result of Phase 1b activities.</p> <p>A second phase is expected to address low ambient temperature, high altitude test procedures, and possibly durability and conformity issues.</p> <p>A third phase would eventually include the addition of reference fuels, correlation across existing regional/national cycles, and introduction of emissions limits.</p> <p>The <a href="https://wiki.unece.org/display/trans/Latest+GTR+15" target="_blank">latest draft version</a> of the amended GTR is regularly updated by the WLTP informal working group.</p> <p>The regulation is also supplemented by a <a href="https://wiki.unece.org/display/trans/Gearshift+calculation+tool" target="_blank">gearshift calculation tool</a>. WLTP Worldwide Harmonized Light Vehicle Emissions Test Procedure GTR No. 15 GTR No. 15 | GTR | 15 | |
| GTR No. 19 Evaporative emissions | Motor vehicle evaporative emissions | Under the Phase 2 development of GTR No. 15, the WLTP informal group began considering evaporative emissions. This resulted in the adoption of GTR 19 on Evaporative Emissions under the WLTP test cycle in June 2017. Evaporative emissions Motor vehicle evaporative emissions GTR No. 19 GTR No. 19 | GTR | 19 |