Mr. Yongyut Nakdaeng said that in the process of improving, developing, and raising the country’s standard in automotive engineering, Thailand Automotive Institute, therefore, had adopted an improvement approach of the bus’s main structure by putting highest concern on the passengers’ safety. To this end, it was the assessment of structural integrity of the bus’s structure, which the researchers had used a computer simulation to help analyze and design under various conditions, such as the capacity of the bus’s structure production by the domestic manufacturers, the domestic raw materials usage, the appropriate weight, and its cost. Simulations of the virtual bus and passengers’ weight to assess the bus’s structure performance were carried out by overturning the bus prototype to analyze for its safety. If the bus’s structure were reformed after hitting the ground, the reformed part should not penetrate the passenger’s safety area according to the United Nations Regulation (UN R66) requirements. Once the bus prototype passed the test, the developers could use it as a guidance for the domestic manufacturing. The developed bus prototype is aimed to be used for passenger transportation with a height of 3.60 meters or more. This developed bus prototype can be used with the bus that is newly registered, has changed its vehicle body, or has already notified its cancelation used under Section 79 of the Land Transport Act 2522, and later signed for its new registration, which will become effective from January 1, 2023, conforming to the guidelines for raising Thailand’s automotive engineering standards to be equivalent to the international standards.