This paper shows the results of a study conducted on five different categories of vehicles in a specific test site. The aim was to\ninvestigate how the effect of the test site discontinuity determines variations of comfort related to the increase in speed and to the\nfive selected road vehicles of different classes. Measurements were obtained by combining data relating to vibrations in the three\nreference axes, detected through a vibration dosimeter (VIB-008), and geolocation data (latitude, longitude, and speed) identified\nby the GPS inside a smartphone. This procedure, through the synchronization between dosimeter and GPS location, has been\nhelpful in postprocessing to eliminate any measurement anomalies generated by the operator. After the survey campaign it was\ndetermined that a formulation allows defining a Comfort Index (CI) depending on velocity and five vehicles of different classes.\nThis study showed that the presence of speed bumps, in the test site investigated, appears to be uncomfortable even at speeds well\nbelow those required by the Highway Code.
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