Abstract
This paper considers the effects of vehicular vibration on passenger comfort and reports the results of a series of questionnaire investigations to examine both the qualitative and quantitative effects of vibration. Although in their infancy, it is argued that field investigations of the type described in this paper are of more value to the design engineer than are many of the investigations carried out under laboratory conditions. However the author points out that the measurement errors and problems incurred during field investigations are much increased compared with laboratory studies. Relationships between vibration and motion intensity and journey comfort level are shown graphically.