Dear K.Sombat,
I saw today the driver of K.Arien walked through the 3rd floor by using the back door from processing. It is not right. So, please review the access authorization for all drivers that they can enter only 1st floor main office area (front and back door)
For visitor from HO, key card should also be provided at reception desk (1st floor) with limited authorization
Regards,
Manit P