Proposed Amendment to Table 2 of the “Motor Vehicle Noise Control Standards”  
 
Table 2 Motor Vehicle1 Noise Control Standard Values  (6th Period)  
Testing items  Acceleration 
Noise  Stationary Noise  
PMR <= 25  25 < PMR <= 50  PMR > 50  > 50c.c  > 50c.c. <= 100c. c. >100c.c. <= 175c.c  > 175c.c. <= 550c.c  > 550c.c.  
Sixth  
Period :1 January 2017  New vehicle  
Model  
certif ication  73 74 77 81 87 87 87 92 
In-use vehicle  
testing  - - - 84 90 90 90 94 
Note  
(1). For the sixth period, control standards shall be implemen ted by testing employing 
the motor vehicle noise measurement method announced by the central competent 
authority.  
(2). After January 1,2017, new motorcycle models manufactured domestically and 
imported must comply with 6thth period control standards.  
(3). After Janu ary 1,2018, all motorcycle models manufactured domestically and 
imported must comply with 6thth period control standards.  
(4). For motorcycles , PMR>50  and category L 3, tested in second gear only, the 
acceleration noise standard value shall be increased by 1 dB( A). 
(5). For motorcycles, category L 5, acceleration noise standard value  of New vehicle 
Model certification is 80 dB(A).  
(6). For motorcycles, PMR<25 and category L 3, the sound pressure level of wide -open -
throttle test obtained in accordance with motor vehicle noise  measurement method 
announced by the central competent authority, shall not exceed the acceleration 
noise standard value  by more than 5 dB.  
(7). For motorcycles, PMR>100, stationary noise standard value s, in accordance with 
Article 13 of the Motor Vehicle Type Noise Testing Compliance Verification 
Issuance and Revocation and Random Noise Testing Handling Regulations, shall be 
increased by 2 dB(A) than listed standard values of new type vehicle testing.  
(8). The approval of a vehicle, in accordance with Article 13 and  14 of the Motor 
Vehicle Type Noise Testing Compliance Verification Issuance and Revocation and 
Random Noise Testing Handling Regulations, shall be comply with Additional 
Sound Emission Provisions of motor vehicle noise measurement method announced 
by the central competent authority.  
(9). Applicant of the approval of a vehicle who submit Compliance Certification Issued 
by European Union member country, in accordance with Article 13 of the Motor 
Vehicle Type Noise Testing Compliance Verification Issuance and Revo cation and 
Random Noise Testing Handling Regulations, shall carry out conditioning test of 
Exhaust Silencing Systems Containing Acoustically absorbing Fibrous Materials of 
motor vehicle noise measurement method announced by the central competent 
authority.  
                                                
1 The proposed amend ed texts are underlined for ease of understandi ng.  
   
Testing items  Vehicles  
Acceleration Noise  Stationary Noise  
M category  N category  
Sedan, Station 
wagon  minibuses, delivery trucks, less than 
3.5 tons  Delivery 
trucks, city 
buses over 
3.5 tons  M1 M2 M3 N1 N2 N3 
PMR  120  120 < PMR  160  PMR > 160   PMR>200, no. of seats  4, R -
point height<450 mm from the 
ground  M 2.5t 2.5t < M  3.5t M > 3.5t, P n  135 kW  M > 3.5t, P n > 135 kW  Pn  150 kW  150 kW < P n  250 kW  Pn > 250 kW  M  2.5t M > 2.5t  Pn  135 kW  Pn > 135 kW  Pn  150 kW  150 kW < P n  250 kW Pn > 250 kW   4000cc  > 4000cc  ＜150 kW  ≧150 kW  
Sixth period  New 
vehicle  
Model 
certifica -
tion Phase 1  72 73 75 75 72 74 75 75 76 78 80 72 74 77 78 79 81 82 93 
(98) 96 
(98) 93 93 99 Phase 2  70 71 73 74 70 72 73 74 74 77 78 71 73 75 76 77 79 81 
Phase 3  68 69 71 72 69 71 72 72 73 76 77 69 71 74 75 76 77 79 
In-use vehicle 
testing  - - - - - - - - - - - - - - - - - - 93 
(100)  96 
(100)  93 93 99 
Notes.  
Sixth period  control standards for vehicles:  
（1） Motor vehicle noise measurement method of sixt h period  control standard for vehicles must meet the requirements of annex 3, 4 and 7 of 
UN/ECE Regulation NO. 51 -03 and its relative modifications.  
（2） As from 1st July 2018, new type -approvals of domestically produced and imported vehicles must comply with t he phase 1of sixth period  
control standards.  
（3） Until 30th June 2023 for existing vehicle types other than category N 2, and until 30th June 2024 for existing vehicle types of category N 2, 
domestically produced and imported vehicles which have been granted acc ording to fifth period  control standards can continue to be 
produced and shipped.  
（4） As from 1st July 2021 for all vehicle types other than category N 2 and as from 1st July 2023 for vehicles types of category N 2, the new 
type-approvals of domestically produce d and imported vehicles must comply with the phase 2 of sixth period  control standards.  
（5） Until 30th June 2023 for existing vehicle types other than category N 2, and until 30th June 2024 for existing vehicle types of category N 2, 
domestically produced and im ported vehicles which have been granted according to phase 1 of sixth period  control standards can 
continue to be produced and shipped.  
（6） As from 1st July 2025 for all vehicle types other than category N 2, N3, M 3 and as from 1st July 2027 for vehicles types of category N 2, N3, 
M3, the new type -approvals of domestically produced and imported vehicles must comply with the phase 3 of sixth period  control 
standards.  
（7） Until 30th June 2027 for existing vehicle types other than category N 2, N 3, M 3, and until 30th June 2028 for existing vehicle types of 
category N 2, N3, M 3, domestically produced and imported vehicles which have been granted according to phase 2 of sixth period  control 
standards can continue to be produced and shipped.  
（8） The limit values of the test for c hecking Conformity of Production (COP), in accordance with Article 11 and 13 of the Motor Vehicle 
Type Noise Testing Compliance Verification Issuance and Revocation and Random Noise Testing Handling Regulations, shall be 
increased by 1 dB(A) than the liste d limit values for acceleration noise with all types, and stationary noise with sedans, station wagons 
with rear engines.  
（9） For vehicle types of category M 1 derived from N 1 vehicle types having a technically permissible maximum laden mass above 2.5 tons and 
a R-point height greater than 850 mm from the ground, the new type -approval limit values of category N 1 having a technically 
permissible maximum laden mass above 2.5 tons apply.  
（10） For vehicle types designed for off -road use (as defined in the Consolidated Re solution on the Construction of Vehicles (R.E.3.), document 
ECE/TRANS/WP .29/78/Rev.3, para. 2), the limit values shall be increased by 2 dB(A) for M3 and N3 vehicles category and 1 dB(A ) for 
any other vehicle category. For vehicle types of category M1 the increased limit values for off -road vehicles are only valid if the 
technically permissible maximum laden mass >2 tons.  
（11） Limit values shall be increased by 2 dB(A) for category M1 constructed or converted specifically in accordance with the requi rements of 
Wheelchair accessible vehicle of Vehicle Safety Testing Directions.  
（12） For vehicle types of category M3 having a gasoline only engine, the applicable limit value is increased by 2 dB(A).  
（13） For vehicle types of category N1 having a technically permissible maximu m laden mass of less than or equal to 2.5 tons, the engine 
capacity not exceeding 660 cc and the power -to-mass ratio (PMR) calculated by using the technically permissible maximum laden mass 
not exceeding 35 and a horizontal distance "d" between the front a xle and the driver's seat R point of less than 1,100 mm, the limits of the 
vehicle types of category N1 having a technically permissible maximum laden mass above 2.5 tons apply.  
（14） For new vehicle type certification and new vehicle testing of sedans and stati on wagons with engines located in the rear, the stationary 
noise standard value shall be 98 dB(A). (the plane perpendicular to the front edge of the vehicle engine block and the vehicl e's 
longitudinal centre  line; if located behind the centre  of the line c onnecting the forward most axial centre  and the rearmost axial centre , 
the vehicle shall be considered to have a rear engine)  
（15） The approval of a vehicle, in accordance with Article 13 and 14 of the Motor Vehicle Type Noise Testing Compliance Verificati on 
Issuance and Revocation and Random Noise Testing Handling Regulations, shall be comply with Additional Sound Emission Provision s 
of motor vehicle noise measurement method announced by the central competent authority.  
（16） Applicant of the approval of a vehicle wh o submit Compliance Certification Issued by European Union member country, in accordance 
with Article 13 of the Motor Vehicle Type Noise Testing Compliance Verification Issuance and Revocation and Random Noise Test ing 
Handling Regulations, shall carry out conditioning test of Exhaust Silencing Systems Containing Acoustically absorbing Fibrous 
Materials of motor vehicle noise measurement method announced by the central competent authority.