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首页> 外文期刊>International journal of sustainable transportation >Driving around turbo-roundabouts vs. conventional roundabouts: Are there advantages regarding pollutant emissions?
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Driving around turbo-roundabouts vs. conventional roundabouts: Are there advantages regarding pollutant emissions?

机译：绕过涡轮回旋处和传统回旋处：在污染物排放方面是否有优势？

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This article addresses the impact of turbo-roundabouts located in urban areas on pollutant emissions using field measurements of vehicle activity data and road congestion levels. The research also compares the emissions of vehicles moving along a turbo-roundabout and a conventional multilane roundabout. Based on field measurements taken at turbo-roundabouts without curb dividers located in Grado, Spain, and multilane roundabouts in Aveiro, Portugal, three representative speed profiles for each speed trajectory were identified: no stop (I), stop once (II), and multiple stops (III). This study also develops discrete models for turbo-roundabouts and multilane roundabouts in which the relative occurrence of those speed profiles is expressed as a function of the entry and conflicting traffic flows. The vehicle specific power (VSP) methodology is then employed to estimate second-by-second pollutant emissions. This study tests the hypotheses that emissions are impacted by the differences in (1) the characteristics of speed profiles in each movement, (2) the volumes of entry and conflicting flows, (3) the overall saturation level, and (4) the transportation facility considered (turbo-roundabout / multilane roundabout). Considering the selected case studies and traffic demands, vehicles at turbo-roundabouts generated more emissions (15-22%, depending on the pollutant) than multilane conventional roundabouts, especially under medium and high congestion levels. These findings suggest that there are no advantages in implementing turboroundabouts from an environmental point of view, regardless of the traffic congestion levels.
机译：本文通过对车辆活动数据和道路拥堵程度的现场测量来解决位于市区的涡轮回旋处对污染物排放的影响。该研究还比较了沿涡轮回旋处和传统的多车道回旋处行驶的车辆的排放。根据在西班牙格拉多不设遏制分隔线的涡轮回旋处和葡萄牙阿威罗的多车道回旋处进行的现场测量，确定了每种速度轨迹的三个代表性速度曲线：无停顿（I），停顿一次（II）和多站（III）。这项研究还开发了涡轮回旋处和多车道回旋处的离散模型，其中，这些速度曲线的相对出现被表示为进入和冲突交通流的函数。然后，采用车辆特定功率（VSP）方法来估算每秒的污染物排放量。这项研究检验了以下假设：排放受以下因素的影响：（1）每个运动的速度曲线特征；（2）进入流量和冲突流量；（3）总体饱和度；（4）运输。考虑的设施（涡轮回旋处/多车道回旋处）。考虑到选定的案例研究和交通需求，涡轮回旋处的车辆产生的排放量比多车道传统回旋处产生的排放量更多（15-22％，取决于污染物），尤其是在中等和高拥挤水平下。这些发现表明，从交通角度考虑，无论交通拥挤程度如何，实施涡轮环形交叉路口都没有任何优势。

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