Touch-screen task-element times for improving SAE recommended practice J2365 : a first proposal.
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2015-10-01
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Abstract:This report describes the identification of task elements and the estimation of their times for in-vehicle tasks such as dialing a phone number or finding a song using a touch screen. These
elements were derived from an experiment in which 24 drivers distributed across three age groups
completed 40 trials involving various in-vehicle tasks. These data will be used to develop a new
version of Society of Automotive Engineers Recommended Practice J2365, which is used to
predict task times when the driver interface is at the wireframe stage, well before hardware and
software are available to collect driver-performance data. The predicted, static (non-driving) task
times are used to predict which tasks are most likely to be unacceptably distracting and unsafe to
do while driving.
Based on those data, the following elements were identified along with initial estimates for young
drivers (age = 24). Estimates for other ages can be obtained by multiplying the times that follow
by age-correction factors described in the report. Elements and their times include cursor other
(read page content, 2.4 s), cursor 1 (cursor down an first ordered page, 2.7 s), cursor 2 (cursor
down on a subsequent page, 0.8 s), drag (3.5 s), function button 1 (for initial screen, 2.9 s),
function button 2 (2.4 s for following screens), press and hold (a button, 1.6 s), letter 1 (entering a
letter on a new screen, 1.9 s), letter 2 (entering a subsequent letter, 1.0 s), number 1 (entering a
number on a new screen, 1.4 s), number 2 (entering a number on a subsequent screen (0.7 s),
slider s (after a new screen, 5.0 s), and slider 2 (after the first, 2.5 s).
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