Subjects were pretested in an on-the-road situation requiring that they estimate the last possible moment for safely passing a lead vehicle in the face of an oncoming vehicle. The subjects were then exposed to a number of filmed scenes and again required to estimate the last possible safe moment for passing. Half the subjects received feedback concerning the accuracy of their estimates while the others did not. A posttest conducted on the road showed that there was a significant improvement in the performance of the group that had received feedback during the training session.
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