Table 2.

Effects of vibration on people as defined by the International Standard Organization (ISO). These data were obtained from ISO 2631-1 (1997) as supported and adopted by the Taiwan High-Speed Rail to limit the vibration and acceleration for safety aspects. The health, comfort, perception, and motion of passengers are also considered.

Acceleration	Body of Sensation
<0.03 g	No sensation
0.03–0.07 g	Very mild discomfort
0.07–0.1 g	Mild discomfort
0.1–0.16 g	Moderate discomfort
0.16–0.25 g	Severe discomfort
>0.25 g	Very severe discomfort