Thanks for the replies and your thoughts guys.
I did actually email to the Vietnamese department of transport seeking clarification on the recognition of IDP's in Vietnam.
I explained that there was the 1949 Geneva Convention on Road Traffic and the 1968 Vienna Convention on Road Traffic. And asked if the 1949 Geneva convention was recognized in Vietnam.
Never got a reply.
I then emailed my Malaysian department of transport seeking clarification if the IDP issued by the government was recognized in Vietnam.
Never got a reply too.
Now here comes the interesting/confusing part.
My IDP issued by the Malaysian department of transport (equivalent to the DMV in the states) has a page of contracting states. And on this page it states Vietnam is a contracting state.
If you check the document that I attached earlier, the UN document for the Geneva Convention 1949 shows Vietnam ratified the 1949 Geneva convention on 2nd November 1953. (I would assume that it is South Vietnam officially known as the Republic of Vietnam which was Western friendly that ratified the Geneva 1949 Convention on Road Traffic in 1953. North Vietnam was officially known as Democratic Republic of Vietnam was communist).
Then the Vietnam war erupted from 1955 until the fall of Saigon in 1975 and North & South Vietnam unified in July 1976 as the Socialist Republic of Vietnam. Till today Socialist Republic of Vietnam remains the official name.
Vietnam ratified the Vienna 1968 Convention on 20th August 2014.
So, from what I have been told, the 1953 ratification of the 1949 Geneva convention is not valid as this country (South Vietnam or Republic of Vietnam does not exist after 1976).
I also checked with the travel insurance provider and asked if I was covered by their travel policy while driving/riding in Vietnam. The insurance company just replied as long as I am legal to drive/ride in Vietnam I would be covered. I asked for the definition of legal and this was what they replied in an email:
"With regards to your email, we wish to make it clear to you that XXXX as an insurance provider will only provide coverage if the International Driving License validity is fully recognized/approved by Malaysia and Vietnam. Please note that license validity is only authorized by the license owner (JPJ).
Hence, you are advised to address any enquiries related to license validity directly to the JPJ."
FYI - JPJ is the Malaysian government department of Road Transport.
So in summary I am still not sure if driving/riding in Vietnam is legal if your IDP follows the Geneva 1949 convention.
However if your IDP follows the Vienna 1968 convention on road traffic, then you would be legal according to your domestic driving license class.
I did a month of motorcycle touring Vietnam in November 2022 and the bike rental companies do not ask if you have IDP or a motorcycle driving license.
As far as to the cops in Vietnam, some say the local cops do not know the different type of IDP and you would be good if your IDP allows you to ride motorcycle. And some say the cops know that foreigners are not legal to ride motorcycles in Vietnam even with a IDP (whether it is a 1949 Geneva or 1968 Vienna convention). All they want is some $$$/VND Dong.
My only concern is that if I get into an accident while riding a motorcycle in Vietnam, will my travel insurance cover me?
Vietnam is such a beautiful country to do motorcycle touring.
In fact I am going back to Hanoi end of May 2023 for another month of motorcycle touring. I will be doing the North West of Vietnam starting from Lao Cai and skirting the Chinese border and ending at Dien Bien Phu before heading back to Hanoi.