•Caffeine was found to marginally reduce drowsiness, but also to disrupt its impact on driving errors.•Placebo group: replicated the drowsiness – driving errors link.•Caffeine group: driving errors significantly reduced and remained independent of drowsiness.•Results extend the view that caffeine protects performance by reducing drowsiness, our data show a direct impact of caffeine on task errors.
Transportation Research Part F: Traffic Psychology and Behaviour – Elsevier
Published: Apr 1, 2018
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