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DRIVER UNDERSTANDING OF SIMULTANEOUS TRAFFIC SIGNAL INDICATIONS IN PROTECTED LEFT TURNS.
| 题名： | DRIVER UNDERSTANDING OF SIMULTANEOUS TRAFFIC SIGNAL INDICATIONS IN PROTECTED LEFT TURNS. |
| 作者： | Noyce-DA; Kacir-KC |
| 关键词： | Aged-drivers; Comprehension-; Driver-errors; Drivers-; Protected-permitted-left-turns; Signal-displays; Simultaneous-traffic-signal-indications; Surveys-; Traffic-signals |
| 摘要： | A comprehensive assessment of protected and permitted left-turn (PPLT) signal displays was performed considering safety, operational performance, and driver-understanding measures. The research focused on a study of driver understanding of protected left-turn indications. All currently used PPLT display arrangements and protected indication combinations were evaluated, including those with simultaneous green-arrow and red- or green-ball indications and those with the green-arrow indication only. Driver understanding was evaluated through a computer-based driver survey completed by 2,465 drivers. In total, 73,950 survey responses were received pertaining to the 200 different survey scenarios evaluated, 24,863 pertaining to protected left-turn indications. Findings show that the simultaneous illumination of the green-arrow and red-ball indications in a five-section PPLT signal display during a protected left-turn phase significantly reduces driver understanding and increases driver error. This finding is especially true for drivers over the age of 65. Simultaneous illumination of the green-arrow and green-ball indications also resulted in levels of driver understanding lower than the green-arrow-only indication; however, these differences were not statistically significant. |
| 总页数： | Transportation Research Record. 2002. (1801) pp18-26 (5 Fig., 5 Tab., 7 Ref.) |
| 报告类型： | 科技报告 |
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