Abstract
The major objective of this research was to investigate and compare driver comprehension and understanding of different types of left-turn signal clearance indications for protected left turns. Forty subjects, male and female drivers, were tested. The test utilized color slides and color motion-picture film segments to present the subject with both steady and flashing left-turn signal indications. After each presentation of a signal indication, the subject responded by pressing one of three answer buttons. Accuracy and reaction times of each response were recorded. The results of this investigation recommended that three signal sequences be field tested as they conveyed their intended messages to the subjects more efficiently than the remaining eleven. The results also indicated that none of the three flashing signals tested proved to be effective.
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