Most countries, even if they do not formally participate in the 1958 agreement, recognise UN rules and either reflect the content of UN rules in their own national requirements or allow the import, registration and use of VEHICLES tested by the UN or both. The United States and Canada (with the exception of lighting rules) are the two main exceptions; UN rules are generally not recognized and UN-compliant vehicles and equipment are not permitted for import, sale or use in both regions unless they are subject to verifications of compliance with the region`s vehicle safety legislation or for limited use of vehicles (e.g. B auto-show screens).  The World Forum for Harmonization of Vehicle Regulations is a working group (WP.29) of the Sustainable Transport Division of the United Nations Economic Commission for Europe (UNECE). Its mission is to manage the multilateral agreements signed in 1958, 1997 and 1998 on technical regulations for the construction, approval of wheeled vehicles and their periodic technical inspection, and to develop and amend, within the framework of these three agreements, the United Nations rules, the United Nations global technical regulations and the United Nations rules and vehicle regulations. The most notable non-signatory to the 1958 agreement is the United States, which has its own federal motor vehicle safety standards and does not recognize UN type-approvals. However, both the United States and Canada are parties to the 1998 agreement. Vehicles and components with UN specifications that do not also comply with US regulations cannot therefore be imported into the United States without major modifications. Canada has its own Canadian automotive safety standards, which largely resemble the US FMVSS, but Canada also accepts UN-compliant headlights and bumpers. The upcoming Comprehensive Economic and Trade Agreement between Canada and the European Union could result in Canada recognizing more UN rules than acceptable alternatives to Canadian rules.  Canada currently applies 14 of the 17 core standards of the JIT as permitted alternatives, namely motorcycle controls and displays, motorcycle mirrors and electronic passenger car stability control. [Citation required] These three remaining groups will be admitted until the ratification of the trade agreement in Canada.
[Citation required] As of 2015 [update], there are 135 UN arrangements that are annexed to the 1958 agreement; Most requirements cover a single component or technology of the vehicle. It is followed by an incomplete list of the current rules applicable to passenger cars (other rules may apply to heavy vehicles, motorcycles, etc.). The 1958 Agreement is based on the principles of type-approval and mutual recognition. Any country that adheres to the 1958 agreement is allowed to test and approve the design of a product regulated by each manufacturer, regardless of the country in which that component was manufactured. Each design of each manufacturer is considered an individual type. As soon as an acceding country grants a type-approval, any other acceding country is obliged to comply with that approval and to consider that vehicle or equipment as legal for import, sale and use. Items tested under a UN regulation are marked with an E and a number within a circle. The number indicates the country that approved the article and other surrounding letters and numbers indicate the exact version of the Regulation or the type-approval number.
From 2016 [updated], participants in the 1958 Convention were accompanied by their United Nations Country Code: The Convention on the Establishment of Comprehensive Technical Rules for Wheeled Vehicles, Equipment and Parts that can be Fitted and/or Used in Wheeled Vehicles, or the 1998 Agreement is a subsequent agreement. . . .