Beyond the Seat: Exploring Passengers’ Ride Comfort in Cars Physical, Psychological and Functional Comfort Dimensions and Influencing Factors

Doktorsavhandling, 2026

While previous car comfort research has predominantly focused on physical discomfort and on drivers, empirical knowledge of passengers’ perceptions of ride comfort remains limited. This thesis addresses this gap by adopting a holistic, passenger-centred perspective on ride comfort in cars. The overall aim of this thesis is to increase the understanding of car passengers’ perceptions of ride comfort, grounded in passengers’ own experiences. To achieve this aim, a mixed-methods research approach was employed, across four empirical studies described in five appended papers. The research progressed iteratively, beginning with a focus on physical comfort, posture, and seat belt fit, and gradually expanding to include psychological comfort, functional comfort and activity engagement. The data collection methods included interviews, questionnaires and video observations from in-car studies on road, as well as free-text responses from a survey of a broader passenger population, enabling exploration of passengers’ own perceptions of ride comfort.
 
The findings show that passenger ride comfort constitutes three interrelated dimensions: physical, psychological, and functional comfort, influenced by individual, artefactual, and contextual factors. These dimensions are dynamically interrelated, such that changes in one dimension may influence others to varying degrees of prominence. Functional comfort, conceptualised as the possibility to engage in activities, plays a central role as activity engagement allows passengers to regulate both physical and psychological comfort. Based on these findings, the thesis presents a holistic Passenger Ride Comfort Framework, illustrating relationships between passengers’ perceptions of ride comfort and influencing factors, and provides empirically informed questionnaire tools for assessing passenger ride comfort. These contributions can support future research as well as evaluation and development of interiors in new passenger cars.
 
In conclusion, passenger ride comfort is a complex, multidimensional phenomenon, affected by the interplay of factors that influence in combination, rather than as isolated factors. Passengers’ perceptions of ride arecontinuously reassessed and may fluctuate in different directions over the course of a ride, not only in response static and dynamic influencing factors, but also due to passengers’ focus of attention and activity engagement. Capturing this complexity requires empirically grounded mixed-methods approaches, in which objective and subjective measures are combined to provide a complementary basis for analysis, while interviews and free-text responses support the interpretation of questionnaires and video observations, advancing the understanding of passengers’ perceptions of ride comfort.