The paper attempts to list the most important fields in which research on human factors in road transport is required. The importance of improving the efficiency of road transport is emphasized, and the figures for road casualties are quoted to demonstrate the need to study the behaviour of cyclists, motor-cyclists and pedestrians as well as motorists. The problems on which research is required are grouped under the six headings of perception, communication of information, control of the vehicle, comfort, protection of occupants, and behaviour of drivers. Subjects regarded as of particular interest are (1) the communication of information to the driver, (2) the design of the vehicle to improve control by the driver, (3) crash injury protection for the motorist and for the motor-cyclist, and (4) the study of the driving task.