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Table 3 R.M.S vibration levels and passenger perception [24]

From: Suitability of Tilting Technology to the Tyne and Wear Metro System

R.M.S. vibration level Passenger perception
<0.315 m/s2 Not comfortable
0.315–0.63 m/s2 A little uncomfortable
0.5–1 m/s2 Fairly uncomfortable
0.8–1.6 m/s2 Uncomfortable
1.25–2.5 m/s2 Very uncomfortable
>2 m/s2 Extremely uncomfortable