Document ID: chunk:federal_register_of_legislation:F2021C00509:front:0:p18
Version: federal_register_of_legislation:F2021C00509
Segment Type: other
Provision Reference: 
Character Range: 56167–59062

such a way that the longitudinal median plane of the vehicle is as close as possible to the line CC' and approach line AA' at a steady speed as specified below. When the front of the vehicle reaches the line AA', the throttle shall be fully opened as rapidly as practicable and held in the fully-opened position until the rear of the vehicle crosses line BB'; the throttle shall then be closed again as rapidly as possible.

           3.1.1.4. In the case of articulated vehicles consisting of two non-separable units regarded as a single vehicle, the semi-trailer shall be disregarded in determining when line BB' is crossed.

           3.1.1.5. The maximum sound level expressed in A-weighted decibels [dB(A)] shall be measured as the vehicle is driven between lines AA' and BB'. Such value shall constitute the result of the measurement.

           3.1.2. Determination of the approach speed

           3.1.2.1. Symbols used

            The letter symbols used in this paragraph have the following meaning:
            S: engine rotation speed as indicated under item 9 of annex 1.
            NA: uniform engine rotational speed at the approach of line AA'.
            VA: uniform vehicle speed at the approach of line AA'.
            Vmax: maximum speed declared by the vehicle manufacturer.

           3.1.2.2. Vehicle with no gearbox

            For vehicles with no gearbox or with no transmission control, the uniform speed at the approach of line AA' will be such that:
            eitherVA = 50 km/h;
            orVA corresponding to NA = 3/4 S and
            VA < 50 km/h
            in the case of vehicles of category M1 and in the case of vehicles of categories other than M1, having an engine power not greater than 225 kW (ECE);
            orVA corresponding to NA = 1/2 S and
            VA < 50 km/h
            in the case of vehicles not belonging to categoryM1 having an engine power greater than 225 kW(ECE).

            or, in the case of vehicles powered by an electric motor

            whichever is the lower.

           3.1.2.3. Vehicle with a manually-operated gearbox

           3.1.2.3.1. Approach speed

            The vehicle shall approach the line AA' at a steady speed with a tolerance +/- 1km/h; except where the controlling factor is engine speed the tolerance shall be the larger of +/ - 2%or +/- 50min-1, such that:
            either rVA = 50 km/h;
            or VA corresponding to NA = 3/4 S and
            VA < 50 km/h
            in the case of vehicles of categoryM1 and in the case of vehicles of categories other than M1, having an engine power not greater than 225 kW (ECE);
            or VA corresponding to NA = 1/2 S and
            VA < 50 kW/h
            in the case of vehicles not belonging to categoryM1 having an engine power greater than 225 kW (ECE).
            or, in the case of vehicles powered by an electric