Directive 97/24/EC of the European Parliament and of the Council on certain components and characteristics of two or three-wheel motor vehicles.
This Directive makes provision in respect of certain components and characteristics to be fulfilled by two or three-wheel motor vehicles. Among those components and characteristics, permissible sound level and exhaust systems are included for the purpose of contributing to the protection of the environment, particularly against atmospheric and noise pollution. Member States may make provision for tax incentives only for motor vehicles conforming to the air pollution and noise pollution measures laid down in this Directive.