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TableĀ 4 Ride index (Wz) and passenger perception [23]

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

Ride index Wz Vibration sensitivity
1 Just noticeable
2 Clearly noticeable
2.5 More pronounced but not unpleasant
3 Strong, irregular, but still tolerable
3.25 Very irregular
3.5 Extremely irregular, unpleasant
4 Extremely unpleasant: prolonged exposure harmful