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Influence of Experimental Advisory Exit Speed Limit on Freeway Exit Ramp Traffic Speeds

机译：实验咨询出口速度限制对高速公路出口匝道交通速度的影响

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Many crashes occurred around freeway exit ramp areas due to speeding and speed variance, especially in China.Traditionally, a posted ramp speed limit will be installed around physical gore area to manage speed around the area.Unfortunately, the field study showed that speeding and speed variance haven't been improved too much afterintroduction of posted ramp speed limit. An additional speed limit on deceleration lane may be needed toaccommodate the speed changes ahead of physical gore, which could be functioned by Advisory Exit Speed Limit(AESL). However, no systematic research on the influences of AESL and its application has been reported yet. Thus,the primary objective of the paper is to investigate its influences on exiting vehicles' speed. A general method wasdeveloped to measure AESL and facilitate the application in different Sites. To achieve this goal, three Sites withsame exit ramp configuration in China were selected and two Scenarios (with AESL/ without AESL) wereinvestigated to quantify the influences. With two hours data collection for each Scenario at each Site, the speed anddeceleration rate of approximately 480 vehicles were obtained. Meanwhile, t-test was introduced to verify thedifferences in speed between the two Scenarios. Results showed that with AESL, the mean speed and the 85thpercentile speed reduced significantly at all three Sites, while only one Site performed a significant reduction inspeeding. Unfortunately, no obvious improvement on speed variance achieved at the three sites, even there weresome tendencies on speed decrease on deceleration lane. The paper can provide researchers, managers and engineerswith reasonable foundations, when determining the necessity and ways to install AESL. The proposed methodologywill be especially helpful in China and other developing countries with similar exit ramps.
机译：由于速度和速度变化，在高速公路出口匝道附近发生了许多车祸，尤其是在中国。 传统上，将在物理刺孔区域周围安装张贴的坡道速度限制，以管理该区域周围的速度。 不幸的是，现场研究表明，速度和速度变化并没有太大改善。 引入发布的斜坡速度限制。可能需要在减速车道上设置额外的速度限制，以便 适应物理损伤之前的速度变化，这可以通过咨询出口速度限制来发挥作用 （AESL）。然而，尚未有关于AESL及其应用影响的系统研究报道。因此， 本文的主要目的是研究其对驶出车辆速度的影响。一种通用的方法是 开发用于测量AESL并促进在不同站点中的应用。为了实现这一目标，三个站点 在中国选择了相同的出口坡道配置，并选择了两种方案（使用AESL /不使用AESL） 调查以量化影响。每个站点的每个方案都有两个小时的数据收集，速度和速度 减速率约为480辆。同时，引入了t检验来验证 两种情况之间的速度差异。结果表明，使用AESL，平均速度和第85 在所有三个站点中，百分位数速度均显着降低，而只有一个站点在 超速。不幸的是，即使在三个站点上，三个站点的速度变化也没有明显改善。 减速车道上一些速度下降的趋势。该论文可以为研究人员，管理人员和工程师提供 在确定安装AESL的必要性和方法时，要有合理的基础。拟议的方法 在中国和其他出口斜率相似的发展中国家特别有用。

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