Document ID: chunk:federal_register_of_legislation:F2006L01279:body:0:p6
Version: federal_register_of_legislation:F2006L01279
Segment Type: other
Provision Reference: 
Character Range: 17961–20570

the vehicle is fitted with more than two-wheel drive, it shall be tested in the drive which is intended for normal road use.
    2.2.5  If the vehicle is equipped with devices which are not necessary for its propulsion, but which are used whilst the vehicle is in normal service on the road, those devices shall be in operation in accordance with the specifications of the 'Manufacturer'.

2.3   Measurement of noise of vehicles in motion.
2.3.1   General conditions of test.
2.3.1.1 At least two measurements shall be made on each side of the vehicle.
Preliminary measurements may be made for adjustment purposes, but shall be disregarded.
2.3.1.2 The microphone shall be situated 1.2 m + 0.1 m above the test site surface at a
    distance of 7.5 m + 0.2 m from the path of the vehicle's centreline, measured along the perpendicular (PP') to that line.
2.3.1.3 Two lines, AA' and BB', parallel to line PP' and situated respectively 10m
    forward and 10m rearward of that line shall be marked out on the test site surface. The vehicle shall 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.
2.3.1.4 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.
2.3.1.5 The maximum sound level recorded during this procedure shall constitute the
result of the measurement.

2.3.2   Method of conducting the test.
2.3.2.1 Symbols used.
The letter symbols used in this paragraph have the following meanings:
S  'ESMP,'
NA uniform engine rotational speed at the approach of line AA',
VA uniform vehicle speed at the approach of line AA'.
2.3.2.2 Vehicle with no gearbox.
    For vehicles with no gearbox or with no transmission controls, the uniform speed at the approach of line AA' will be such that either:
NA = ¾ S and VA < 50 km/h,
or
VA = 50 km/h
and within the specified range of +5, -1 km/h of that speed for each test.
2.3.2.3 Vehicle with a manually-operated gearbox.
2.3.2.3.1 Approach speed.
The vehicle will approach the line AA' with uniform speed such that either :
    NA = 3/4 S and VA < 50 km/h,
or
VA = 50 km/h.
and within the specified range of +5, -1 km/h of that speed for each test.
2.3.2.3.2 Choice of gear ratio.
2.3.2.3.2.1 Vehicles of categories MA and NA fitted with a gearbox having four