Sorry, I don't get it. Do I need to change anything? I think it's fine as it is in HB, isn't it?
Nothing has changed on paper. The route might be slightly outdated on the ground with bypasses.
(UN)ECE means (United Nations) Economic Commission for Europe. Why are USA, Canada and the Asians members? It makes no sense at all.
Asia is
1) the attempted Europeanisation of Turkey (it remains an EU candidate, as it has for 20 years. But David Cameron's 2016 policy u-turn meant for a UK audience made clear that it wasn't going to happen and so Erdogan gave up the pretence of being a Western democracy).
2) the former USSR all succeeding into membership on break-up
3) Cyprus has long counted as culturally Europe, despite being geographically Asian.
4) Israel was allowed in after the rest of ESCWA were at-best completely apathetic to it (and Morocco and Mauritania are in that club, as well as Sudan, Libya and Tunisia - because it's not about "Western Asia" but about "Greater Arabia")
The US is in as they are in 3 of the 5 Economic Commissions (not Africa, nor "Western Asia"). The UK and France are similarly in the same 3 - privilege and power.
Canada is in because it fitted better there than "Latin America and the Caribbean" (though it's in that too) - it is and was a developed Western power, rather than a developing country. That said, as well as France and the UK, the obvious cultural partners of Spain and Portugal, and the Netherlands that have land the Caribbean, UNECLAC has Japan, South Korea, Turkey, Italy,
Germany, and Norway as members.
But the inclusive, rather than Euro-quasi-nationalism, approach to membership still doesn't really explain why the southern -stans gained E roads (them and Armenia are the only countries without territory in Europe that have them) when they haven't signed or ratified the Agreement that defines E Roads. Or why this treaty might want to extend to non-members.
The possible extension is as stupid as the whole club already is.
Other stuff from the ECE extends, because the ECE produces decent standards and protocols that are typically ahead of other Economic Commissions due to being long-developed countries, rather than developing/newly-developed. The last four countries to ratify the UNECE 'Vienna' Convention on Road Traffic of 8 November 1968 were Myanmar (2019), Cabo Verde (2018), UK (2018, though signed in 1968) and Saudi Arabia (2016). There's not an Asian, Arab, African or American equivalent as they don't need to reinvent the wheel, so they ratify this one.
And even the EU, who were created to duplicate a lot of ECE functions (and go further) and who's ruling bureaucracy seeks to supplant Geneva with Brussels, wrote into the Japanese trade deal that Japan should implement more ECE protocols. Norwegian politicians (trying to persuade a population who want neither to either join the EU, or to leave the EEA) talk of a fax machine from Brussels telling them regulations they have to adopt, but most of those sent to EFTA countries originate in Geneva and the ECE and get faxed to Brussels (or Strasbourg, or wherever the Eurocracy is that week) for rubber stamping.
It's not irrelevant, it's just ignored. But extending the AGR makes zero sense - as you said the E stands for Europe, and the network already stretches the definition of that. And, as I said, there's other UNEC regional international networks that make it pointless.
