For info, the insurance that available for purchase at those border seller, is only to cover the 3rd party Thai people bodily injury in case of an accident happen and involving Thai citizen.

Their properties (if any) is not covered by the insurance sold on the border (before entering Thailand).

You need to purchase the Por lor Bor (compulsory insurance for vehicle in the Land of Smile)

For motorcar the validity is 2 weeks minimum and for motorcycle minimum as 3 Months.
The one that they sell on border for 2 weeks, the validity is questionable if you purchase it for your motorbike.

Then you (HIGHLY RECOMMENDED) to purchase the 3rd Party voluntary insurance from the Thai insurance agent or company they called it 3+ voluntary vehicle insurance.

This insurance to cover the damage caused for the Thai Citizen properties (Car/Motorcycle/Lembu and so forth) and you can only purchased in one year duration.

Example

They will give you a print out that need to stick into your windshields and clearly mention the car registration number validity of the insurance (one year) and the issuing agent. (Some Thai police roadblock will ask for this especially in northern Thailand after BKK)

This post has been edited by ajaibman: Sep 23 2018, 10:12 PM

This endorsement just to cover your vehicle damage when involve in an accident inside the kingdom of Thai..

If you don't have this endorsement, whatever repair cost/towing to the border is not covered by your own car insurance.

For my peace of mind, I better endorsed.