The survey of effect of cellphone conversation on drivers’ situation awareness and brake reaction time in Bus driving simulator

Background and aims: Increasing use of cell phone while driving is actually part of a disturbing trend of technological impact on reducing the driver's attention. Using the phone during driving increases crash probability between 3 to 6.5 times. Cell phone may deviate drivers’ attention of the driving and may lead to a reduction in driver's situation awareness. The present study investigated the impact of auditory-verbal task on driver’s situation awareness and brake reaction time. Methods: For performing this study, 30 bus drivers drove in the bus driving simulator. Drivers’ situational awareness was measured by situation awareness global assessment technique. Gold directed task analysis method was used to analyze driver’s cognitive tasks. The simulator was automatically recorded braking reaction time of the subjects. Results: Results showed that all levels of drivers’ situation awareness significantly reduced after auditory-verbal task (p<0.001). It also became clear that auditory-verbal task significantly increases the drivers’ brake reaction time (p<0.001). Pearson correlation coefficients showed a significant negative correlation between levels 2 and 3, and total situation awareness and brake reaction time while performing auditory-verbal task (p<0.05). Conclusion: Overall, this study showed that auditory-verbal task while driving can be detrimental on situation awareness and performance.

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