| UN Rule No. 1 Environmental Protection | Vehicle Inspections: Environmental Protection | Uniform provisions for periodical technical inspections of wheeled vehicles with regard to the protection of the environment Requirements for inspections of medium and heavy passenger and commercial vehicles with regard primarily to exhaust and noise emissions. The World Forum has agreed to consider expanding the scope of UN Rule No. 1 to include light vehicles. Environmental Protection Vehicle Inspections: Environmental Protection UN Rule No. 1 Rule No. 1 | Rule | 1 |