title: The effect of touch-key size on the usability of In-Vehicle Information Systems and driving safety during simulated driving.
abstract: Investigating the effect of touch-key size on usability of In-Vehicle Information Systems (IVISs) is one of the most important research issues since it is closely related to safety issues besides its usability. This study investigated the effects of the touch-key size of IVISs with respect to safety issues (the standard deviation of lane position, the speed variation, the total glance time, the mean glance time, the mean time between glances, and the mean number of glances) and the usability of IVISs (the task completion time, error rate, subjective preference, and NASA-TLX) through a driving simulation. A total of 30 drivers participated in the task of entering 5-digit numbers with various touch-key sizes while performing simulated driving. The size of the touch-key was 7.5 mm, 12.5 mm, 17.5 mm, 22.5 mm and 27.5 mm, and the speed of driving was set to 0 km/h (stationary state), 50 km/h and 100 km/h. As a result, both the driving safety and the usability of the IVISs increased as the touch-key size increased up to a certain size (17.5 mm in this study), at which they reached asymptotes. We performed Fitts' law analysis of our data, and this revealed that the data from the dual task experiment did not follow Fitts' law.
authors.affiliation: Dept. of Industrial and Management Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Nam-gu, Pohang 790-784, South Korea. Electronic address: gimigimi@postech.ac.kr.
authors.forename: Heejin
authors.initials: H
authors.lastname: Kim
authors.affiliation: Dept. of Industrial and Management Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Nam-gu, Pohang 790-784, South Korea. Electronic address: samdolee@postech.ac.kr.
authors.forename: Sunghyuk
authors.initials: S
authors.lastname: Kwon
authors.affiliation: Dept. of Industrial and Management Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Nam-gu, Pohang 790-784, South Korea. Electronic address: nzlovpos@gmail.com.
authors.forename: Jiyoon
authors.initials: J
authors.lastname: Heo
authors.affiliation: Dept. of Industrial and Management Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Nam-gu, Pohang 790-784, South Korea. Electronic address: bluestar@postech.ac.kr.
authors.forename: Hojin
authors.initials: H
authors.lastname: Lee
authors.affiliation: Dept. of Industrial and Management Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Nam-gu, Pohang 790-784, South Korea. Electronic address: mkc@postech.ac.kr.
authors.forename: Min K
authors.initials: MK
authors.lastname: Chung
mesh_terms: D000328:Adult; D001334:Automobile Driving / Q000523:psychology*; D001336:Automobiles / Q000592:standards; D003626:Data Display; D006804:Ergonomics; D005133:Eye Movements; D005260:Female; D006801:Humans; D008297:Male; D012449:Safety; D013997:Time Factors; D055815:Young Adult
keywords: In-Vehicle Information System; Touch-key size; Touch-screen