This book constitutes the refereed proceedings of the 6th International Conference on HCI in Mobility, Transport, and Automotive Systems, MobiTAS 2024, held as part of the 26th HCI International Conference, HCII 2024, which took place in Washington, DC, USA, during June 29-July 4, 2024.The total of 1271 papers and 309 posters included in the HCII 2024 proceedings was carefully reviewed and selected from 5108 submissions.The MobiTAS 2024 proceedings were organized in the following topical sections:Part I: Driver behavior and safety; human factors in automated vehicles;Part II: Urban mobility and public transportation; user experience and inclusivity in MobiTAS.