THE THAI DEPT OF TRANSPORT has a complete list of laws and requirements in Thai. This TA article is a pretty good summary.
Be advised that “conventions” still have to abide by these rules and are visa dependent. If you “ live” here YOU NEED A THAI LICENSE. If you are on a tourist visa you need both your home and intl license for the véhicule you are operating and after 60 days you need to apply for a Thai license. After 90 days you are no longer legal and can be held in the country until the incident is settled.
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People wanting to help are posting their “understanding” based on what?
Ignorance of the actual laws won’t save you in a serious accident.