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首页> 外文学位 >Development of a uniform traffic signal display for protected/permitted left-turn control.
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Development of a uniform traffic signal display for protected/permitted left-turn control.

机译：开发了用于保护/允许的左转控制的统一交通信号显示器。

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摘要

A comprehensive assessment of protected/permitted left-turn (PPLT) signal displays was performed considering current usage, safety, operational performance, and driver understanding measures. Information from 168 transportation agencies, at least one in each of the 50 states, was used to quantify the attributes of more than 107,000 signalized intersections. Traffic safety and operations were evaluated by field studies at 24 intersections containing PPLT signal phasing, three each in eight geographical study locations. Driver understanding was evaluated through a computer based photographic driver survey completed by 2,465 drivers. In total, 73,950 survey responses were received pertaining to the 35 different survey scenarios evaluated.; Approximately 29 percent of all intersections in the United States contain PPLT signal phasing. Ninety-eight percent of these intersections use a green ball indication for the permitted phase. The remaining two percent use either a flashing yellow arrow, flashing yellow ball, flashing red arrow, or flashing red ball indication.; No evidence was obtained to suggest that the type of PPLT signal display affected conflict rates, saturation flow rate, or start-up lost time. A significant number of traffic events were found during the protected left-turn phase when the five-section horizontal display simultaneously presented the green arrow and red ball indications. Variation in response time between study locations was related to differences in the signal phasing sequence.; The photographic driver survey results suggested that drivers have a good understanding of the prohibited (all-red) and protected only left-turn indications. The flashing red ball permitted indication had a significantly higher correct response rate than the green ball permitted indication although less than 64 percent of drivers correctly responded. Drivers over the age of 65 found the flashing ball permitted indications easier to comprehend, and responded more quickly with less fail critical errors than with the steady green ball permitted indication.; The flashing red ball permitted indication in a three-section vertical display outperformed all other indication and display combinations, including the most commonly used five-section cluster display with a green ball permitted indication; however, additional study of the flashing permitted indications is required.
机译：考虑到当前的使用情况，安全性，操作性能和驾驶员理解措施，对保护/允许的左转弯（PPLT）信号显示进行了全面评估。来自168个运输机构的信息（在50个州中的每个州中至少有一个）被用于量化107,000多个信号交叉口的属性。通过对包含PPLT信号定相的24个交叉路口的现场研究，对交通安全和运营进行了评估，在八个地理研究位置中各三个。通过对2465名驾驶员进行的基于计算机的摄影驾驶员调查来评估驾驶员的了解程度。总共收到了73,950份有关评估的35种不同调查方案的调查答复。在美国，所有交叉路口中约有29％包含PPLT信号定相。这些交叉路口中有98％在允许的阶段使用绿球指示。其余的百分之二使用闪烁的黄色箭头，闪烁的黄色球，闪烁的红色箭头或闪烁的红色球指示。没有证据表明PPLT信号类型会影响冲突率，饱和流速或启动损失时间。在受保护的左转阶段，当五部分水平显示同时显示绿色箭头和红色球指示时，发现了大量交通事件。研究地点之间响应时间的变化与信号定相序列的差异有关。驾驶员摄影调查结果表明，驾驶员对禁止转弯（全红）和仅受保护的转弯指示有很好的了解。尽管少于64％的驾驶员正确响应，但闪烁的红色球允许指示的正确响应率明显高于绿色球允许的指示。 65岁以上的驾驶员发现，闪动的球允许的指示比起稳定的绿色球允许的指示更容易理解，并且对失败严重错误的反应更快。在三部分垂直显示中闪烁的红色球允许指示优于所有其他指示和显示组合，包括最常用的五部分集群显示和绿色球允许指示；但是，还需要进一步研究允许的闪烁指示。

著录项

  • 作者

    Noyce, David Alan.;

  • 作者单位

    Texas A&M University.;

  • 授予单位 Texas A&M University.;
  • 学科 Engineering Civil.; Transportation.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 328 p.
  • 总页数 328
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;综合运输;
  • 关键词

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