Abstract
Switches on the steering wheel can be handled more easily and safely with less glance time than those at the instrument panel. In our former study, following result was presented, “6 switches on the middle and upper area of steering wheel are more easily handled than those on the lower area as used in the cars available in the present markets.” In this study, considering that the number of steering wheel switches is expected to be increased, maneuverability of 8 switches on the middle area was studied : (a) 8 on obverse side only, (b) 6 on obverse side and 2 on reverse side and (c) 4 on obverse side and 4 on reverse side. No difference can be found between (a) 8 on obverse side only and (b) 6 on obverse side and 2 on reverse side. Both (a) and (b) were better than (c) 4 on obverse side and 4 on reverse side.
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