Today, several vehicles are equipped with a visual display combined with a haptic rotary device for handling in-vehicle information\r\nsystem tasks while driving. This experimental study investigates whether a haptic addition to a visual interface interferes with or\r\nsupports secondary task performance and whether haptic information could be used without taking eyes off road. Four interfaces\r\nwere compared during simulated driving: visual only, partly corresponding visual-haptic, fully corresponding visual-haptic, and\r\nhaptic only. Secondary task performance and subjective mental workload were measured. Additionally, the participants were\r\ninterviewed. It was found that some haptic support improved performance. However, when more haptic information was used,\r\nthe results diverged in terms of task completion time and interface comprehension. Some participants did not sense all haptics\r\nprovided, some did not comprehend the correspondence between the haptic and visual interfaces, and some did. Interestingly, the\r\nparticipants managed to complete the tasks when using haptic-only information.
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