These Standards are determined pursuant to Article 9, Paragraph 3 of the Noise Control Act.
Terms used in these Standards are defined as follows:
Acceleration noise standard value
means the acceleration noise level measured at a certain distance, in a certain gear while driving.
Stationary noise standard value
means the stationary noise level measured at a certain engine speed.
New vehicle model certification
means the new model vehicle noise review and testing performed after each type of new vehicle model has been manufactured or imported, and prior to sale or usage.
New vehicle testing
means noise condition testing performed after a vehicle has passed new vehicle model certification and following a certain period of time or after a designated quantity has been manufactured or imported.
In-use vehicle testing
means non-regular vehicle noise testing at car parks (stops), by the roadside, at diesel emissions testing stations or other suitable locations performed by the competent authority.
Motor vehicle noise control standard values are provided in the Attached table
These Standards shall take effect on the date of promulgation.
| Testing items | Sedan, station wagon |
Specialist vehicles such as mini-buses, delivery trucks and those that have been announced ?3.5 tons |
Specialist vehicles such as delivery trucks, city buses and those that have been announced over 3.5 tons |
Motorized Bicycles | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| <150 kW | ?150 kW | ?50c.c. |
>50c.c. ?100c.c. |
>100c.c. ?175c.c. |
>175c.c. | |||||
| First Period: January 1, 1991 | New vehicle model certification and new vehicle testing | Acceleration noise | 81 | 86 | 86 | 75 | 78 | 81 | ||
| Stationary noise | 103 | 103 | 107 | 95 | 99 | 99 | ||||
| In-use vehicle testing | Stationary noise | For new vehicle models with certified approval documents, add 5 dB(A) to the new type stationary noise testing value. However, may not exceed new vehicle model testing capped values of January 1, 1991. |
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| Second period: January 1, 1993 | New vehicle model certification and new vehicle testing | Acceleration noise | 78 | 83 | 83 | 72 | 75 | 78 | ||
| Stationary noise | 103 | 103 | 107 | 95 | 99 | 99 | ||||
| In-use vehicle testing | Stationary noise | For new vehicle models with certified approval documents, add 5 dB(A) to the new type stationary noise testing values. However, may not exceed new vehicle model testing restriction values of January 1, 1991. |
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| Third period: July 1, 2005 | New vehicle model certification and new vehicle testing | Acceleration noise | 76 | 79 | 82 | 83 | 72 | 75 | 78 | 81 |
| Stationary noise | 96 (100) | 97 | 98 | 99 | 84 | 90 | 94 | 94 | ||
| In-use vehicle testing | Stationary noise | For new vehicle models with certified approval documents, add 5 dB(A) to the new type stationary noise testing values. From July 1, 2005 onward, vehicles manufactured domestically and imported vehicles may not exceed the new vehicle model testing capped values of July 1, 2005. |
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| Fourth Period: January 1, 2007 | New vehicle model certification and new vehicle testing | Acceleration noise | 74 | 77 | 78 | 80 | 72 | 75 | 77 | 80 |
| Stationary noise | 96 (100) | 97 | 98 | 99 | 84 | 90 | 94 | 94 | ||
| In-use vehicle testing | Stationary noise | For new vehicle models with certified approval documents, add 5 dB(A) to the new type stationary noise testing values. From July 1, 2005 onward, vehicles manufactured domestically and imported vehicles may not exceed the new vehicle model testing restriction values of July 1, 2005. |
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The first and second period control standards use September 17, 1987 revisions to CNS 5799 D3058 standard, and the motorized bicycle noise level testing regulations announced by the EPA on December 9, 2003 to implement testing.
Third period control standards:
Uses January 13, 2003, revisions to CNS 5799 D3058 standard to implement testing.
From July 1, 2005 onward, vehicles produced domestically and imported vehicles must meet the third period control standards.
For motorized bicycles under 175c.c.the listed standard value for manual gear vehicle acceleration noise standard values shall be increased by 1 dB(A).
For new vehicle type certification and new vehicle testing of sedans and station wagons with engines located in the rear, the stationary noise standard value shall be 100 dB(A).
Fourth period control standards:
Uses January 13, 2003, revisions to CNS 5799 D3058 standard to implement testing.
From January 1, 2007 onward, vehicles manufactured domestically and imported vehicles must meet fourth period control standards.
In accordance with new vehicle model noise certification abolishing (or changing) random testing regulations of new vehicle testing in Article 13 of this Act, the acceleration noise standard value under new vehicle model testing standard values shall be increased by 1 dB(A).
For sedans, station wagons and minibuses and small delivery trucks under 3.5 tons equipped with direct fuel injected diesel engines, the listed standard value of new type vehicle testing acceleration noise standard values shall be increased by 1 dB(A).
For new type vehicle testing acceleration noise standard values of off-road vehicles over 2 tons (in accordance with 70/156 EEC Annex II off-road vehicle regulations) with engine power greater than 150 kW, the listed standard value shall be increased by 2 dB(A); for engine power less than 150 kW, the listed standard value shall be increased by 1 dB(A).
For five-gear manual transmission sedans and station wagons, minibuses under 3.5 tons, other vehicles with an engine rate greater than 140 kW and power capacity greater than 75 kW per ton and those in third gear at 50 km/h within the testing area that exceed 61 km/hthe listed standard value of the new vehicle model certification acceleration noise standard value shall be increased by 1 dB(A).
For new vehicle type certification and new vehicle testing of sedans and station wagons with engines located in the rear, the stationary noise standard value shall be 100 dB(A).
