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Evaluation and Improvement of Indirect Visibility in Circumferential Area of Commercial Vehicle
Published January 01, 1982 by National Highway Traffic Safety Administration in United States
Indirect visibility of mirrors has conventionally been measured according to an area of vision and there have been no appropriate methods to evaluate a degree of visual cognizance. This paper deals with a concrete evaluation of the visibility of the mirror based on the changeability of basic area and a rate of image distortion.
An evaluation better than the third level in the five ranks of evaluation scale can hardly be hoped for with the present outside- cross-view-mirror on current heavy-duty trucks in Japan.
To improve such situation, we have developed a perioscope mirror system and succeeded in decreasing a number on the left side of confirming mirrors (from 3 to 2) and achieved the best evaluation (5th level).