Document ID: chunk:federal_register_of_legislation:F2021C00509:front:0:p25
Version: federal_register_of_legislation:F2021C00509
Segment Type: other
Provision Reference: 
Character Range: 74717–77643

maximum mass of the tractor vehicle's own load.

           3. Category N - power-driven vehicles having at least four wheels and used for the carriage of goods.

           3.1. Category N1: Vehicles used for the carriage of goods and having a maximum mass not exceeding 3.5 tonnes.

           3.2. Category N2: Vehicles used for the carriage of goods and having a maximum mass exceeding 3.5 tonnes but not exceeding 12 tonnes.

           3.3. Category N3: Vehicles used for the carriage of goods and having a maximum mass exceeding 12 tonnes.

           3.4. Remarks

           3.4.1. In the case of a towing vehicle designed to be coupled to a semi-trailer (tractor for semi-trailer), the mass to be considered for classifying the vehicle is the mass of the tractor vehicle in running trim, increased by the mass corresponding to the maximum static vertical load transferred to the tractor vehicle by the semi-trailer and, where applicable, by the maximum mass of the tractor vehicle's own load.

           3.4.2. The equipment and installations carried on certain special-purpose vehicles (crane vehicles, workshop vehicles, publicity vehicles, etc.) are regarded as being equivalent to goods.
Annex 5

EXHAUST SYSTEMS CONTAINING FIBROUS MATERIALS

           1. Fibrous materials shall not be used in the construction of silencers unless suitable measures are undertaken at the design or production stages to ensure that the efficiency required to comply with the limits imposed in paragraph 6.2.2 of this Regulation is achieved on the road. Such a silencer shall be considered to be efficient on the road if the exhaust gases are not in contact with the fibrous materials or if the silencer of the prototype vehicle tested in accordance with the requirements of paragraphs 3.1 and 3.2 of this Regulation has been put into a normal state for road use before the sound-level measurements are taken. These can be achieved by using one of the three tests described in paragraphs 1.1, 1.2 and 1.3 below or by removing the fibrous materials from the silencer.

           1.1. Continuous road operation for 10,000 km

           1.1.1. About half this operation consists of town driving and the other half of long-distance runs at high speed; continuous road operation can be replaced by a corresponding test-track programme.

           1.1.2. The two speed regimes should be alternated on several occasions.

           1.1.3. The complete test programme must include a minimum of 10 breaks of at least three hours duration in order to reproduce the effects of cooling and any condensation which may occur.

           1.2. Conditioning on a test bench

           1.2.1. Using standard parts and observing the vehicle manufacturer's instructions, the exhaust system or components thereof must be fitted to the vehicle referred to in paragraph 3.3. of this Regulation or the engine referred to in paragraph 3.4. of this