| WP.29/2021/155 | Request to list in the compendium of candidate GTR the USA Durability Driving Enforcement Procedure for two-wheeled vehicles | |
| WP.29/2021/155/Att.1 | US EPA Submittal on Deterioration Factor Requirements for On-Highway Motorcycles | |
| WP.29/2021/155 | Request to list in the compendium of candidate GTR the USA Durability Driving Enforcement Procedure for two-wheeled vehicles | |
| WP.29/2021/158/Att.1 | GB 14622-2016 Limits and Measurement Methods for Emissions from Motorcycles | |
| WP.29/2021/155 | Request to list in the compendium of candidate GTR the USA Durability Driving Enforcement Procedure for two-wheeled vehicles |