Abstract
This study focused on the development of baseline measures of driver visual allocation under normal operating conditions. Thirty licensed truck drivers drove an instrumented heavy truck over a 459 km fixed route in which road type and ambient lighting condition were varied. An on-board video recording system was used to record the subject's visual glances throughout the run. During the run subjects performed three driving tasks: open road driving, car following and in-cab tasks requested by the experimenter. Over all conditions, the mean time off the road was 1.01 s and the mean road scene glance duration was 2.18 s. The results indicated that road type and driving task were significant factors affecting driver visual workload indicators. Ambient light level was not a significant factor affecting the visual allocation of truck drivers.
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