Road Traffic Regulations 1976 (Extracts).

Vehicle Equipment.

Noise.

Technical Requirements for Road Vehicles.

Permissible Sound Level and Exhaust System of Motor Vehicles.

Components and Characteristics of Two or Three Wheel Vehicles - Reference EC Directive 97/24/EC.

Approval of Certain Equipment for Agricultural and Forestry Tractors.

Driver Perceived Noise - Agricultural Tractors.

Highway Code Regulations - Regulamento do Codigo da Estrada (Extracts).

Technical Requirements for Road Vehicles - RNTR-2.