UN Regulation No. 51 on noise emissions

E461644

United Nations Regulation type-approval regulation vehicle noise emission regulation

UN Regulation No. 51 on noise emissions is an international vehicle standard that sets limits and test procedures for the external noise produced by motor vehicles to reduce environmental noise pollution.

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All labels observed (5)

Label	Occurrences
UN Regulation No. 117 on tyre rolling noise	1
UN Regulation No. 51 on noise emissions canonical	1
UN Regulation No. 51.01	1
UN Regulation No. 51.02	1
UN Regulation No. 51.03	1

How this entity was disambiguated

This entity first appeared as the object of triple T4695301 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: UN Regulation No. 51 on noise emissions
Context triple: [United Nations Regulations under the 1958 Agreement, contains, UN Regulation No. 51 on noise emissions]

A. Regulation 14 on sulfur oxides and particulate matter
Regulation 14 on sulfur oxides and particulate matter is a key provision in international maritime environmental law that sets limits on sulfur content in marine fuels and controls emissions of sulfur oxides and particulates from ships to reduce air pollution.
B. Regulation (EC) No 851/2004
Regulation (EC) No 851/2004 is the EU law that established the European Centre for Disease Prevention and Control and defined its mandate, structure, and functions in coordinating infectious disease surveillance and control across member states.
C. Regulation 51
Regulation 51 was a key provision of the United Kingdom’s wartime Defence Regulations that granted broad powers to the government to control or requisition property and resources for national security purposes.
D. Regulation (EU) No 1151/2012
Regulation (EU) No 1151/2012 is a European Union law that establishes the quality schemes and protection framework for agricultural products and foodstuffs, including designations such as Protected Designation of Origin and Protected Geographical Indication.
E. Title II – Emission Standards for Moving Sources
Title II – Emission Standards for Moving Sources is the portion of the U.S. Clean Air Act that regulates air pollution emissions from mobile sources such as cars, trucks, buses, and other vehicles and engines.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: UN Regulation No. 51 on noise emissions
Target entity description: UN Regulation No. 51 on noise emissions is an international vehicle standard that sets limits and test procedures for the external noise produced by motor vehicles to reduce environmental noise pollution.

A. Regulation 14 on sulfur oxides and particulate matter
Regulation 14 on sulfur oxides and particulate matter is a key provision in international maritime environmental law that sets limits on sulfur content in marine fuels and controls emissions of sulfur oxides and particulates from ships to reduce air pollution.
B. Regulation (EC) No 851/2004
Regulation (EC) No 851/2004 is the EU law that established the European Centre for Disease Prevention and Control and defined its mandate, structure, and functions in coordinating infectious disease surveillance and control across member states.
C. Regulation 51
Regulation 51 was a key provision of the United Kingdom’s wartime Defence Regulations that granted broad powers to the government to control or requisition property and resources for national security purposes.
D. Regulation (EU) No 1151/2012
Regulation (EU) No 1151/2012 is a European Union law that establishes the quality schemes and protection framework for agricultural products and foodstuffs, including designations such as Protected Designation of Origin and Protected Geographical Indication.
E. Title II – Emission Standards for Moving Sources
Title II – Emission Standards for Moving Sources is the portion of the U.S. Clean Air Act that regulates air pollution emissions from mobile sources such as cars, trucks, buses, and other vehicles and engines.
F. None of above. chosen

Statements (50)

Predicate	Object
instanceOf	United Nations Regulation ⓘ type-approval regulation ⓘ vehicle noise emission regulation ⓘ
addresses	noise from the exhaust system of vehicles ⓘ noise from the intake system of vehicles ⓘ noise from the powertrain of vehicles ⓘ noise from tyres in certain operating conditions ⓘ
alsoKnownAs	R51 ⓘ UNECE Regulation No. 51 ⓘ linked to: UNECE Regulations
appliesTo	buses ⓘ coaches ⓘ heavy commercial vehicles ⓘ light commercial vehicles ⓘ motor vehicles with at least four wheels ⓘ passenger cars ⓘ
concerns	A-weighted sound pressure levels ⓘ
defines	maximum permissible sound levels for motor vehicles ⓘ microphone positions for noise measurements ⓘ operating conditions for noise tests ⓘ requirements for additional sound reduction devices ⓘ requirements for replacement silencing systems ⓘ test procedures for measuring vehicle exterior noise ⓘ vehicle speeds and gear selection for noise tests ⓘ
goal	facilitation of international trade in motor vehicles ⓘ harmonization of vehicle noise limits among contracting parties ⓘ
hasRevision	UN Regulation No. 51.01 ⓘ linked to: UN Regulation No. 51 on noise emissions UN Regulation No. 51.02 ⓘ linked to: UN Regulation No. 51 on noise emissions UN Regulation No. 51.03 ⓘ linked to: UN Regulation No. 51 on noise emissions
implementedBy	national vehicle type-approval authorities ⓘ
includes	conformity of production requirements for noise ⓘ provisions on background noise levels during tests ⓘ provisions on instrumentation accuracy for noise tests ⓘ provisions on test track characteristics ⓘ type-approval procedures for vehicle noise ⓘ
jurisdiction	contracting parties to the UNECE 1958 Agreement ⓘ
latestSeriesOfAmendments	03 series of amendments ⓘ
legalEffect	type-approval prerequisite in contracting parties to the 1958 Agreement ⓘ
measurementUnit	dB(A) ⓘ decibel A-weighted ⓘ
partOf	1958 Agreement ⓘ
purpose	to limit external noise produced by motor vehicles ⓘ to reduce environmental noise pollution from road traffic ⓘ
regulatingAuthority	UNECE World Forum for Harmonization of Vehicle Regulations ⓘ linked to: World Forum for Harmonization of Vehicle Regulations United Nations Economic Commission for Europe ⓘ
relatedTo	UN Regulation No. 117 on tyre rolling noise ⓘ linked to: UN Regulation No. 51 on noise emissions UN Regulation No. 59 on replacement silencing systems ⓘ
requires	calibrated sound level meters ⓘ specific meteorological conditions during tests ⓘ standardized test track surface for noise measurements ⓘ
subject	external noise emissions of motor vehicles ⓘ