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首页> 外文期刊>Journal of the air & waste management association >Assessing the impact of converting roundabouts to traffic signals on vehicle emissions along an urban arterial corridor in Qatar
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Assessing the impact of converting roundabouts to traffic signals on vehicle emissions along an urban arterial corridor in Qatar

机译：评估将回旋处转换为交通信号对卡塔尔城市动脉走廊沿线车辆排放的影响

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摘要

The type of control at intersections has a major effect on the operation of any urban corridor. Different predefined procedures are available to calculate some of the main operational characteristics, such as capacity, delay, and level of service, in order to select the best type of control. However, there are other important factors that affect major arterials operational characteristics, factors that are not fully addressed, such as the impact of emissions. In this study, a microscopic simulation approach using VISSIM and MOVES was developed to assess the environmental effect of converting four three-lane roundabouts to signalized intersections along a heavily congested urban corridor in Qatar. A decision was made to switch all roundabouts to traffic signals for better operations. Preliminary results indicated that the signal control outperformed the roundabout in the range of 37% to 43% reduction in emissions. A more detailed analysis revealed that roundabout corridor operations' effects on emission rates are divergent from those of signalized corridors, particularly upstream and downstream of the intersections. Immediate roundabout upstream approaches are driver behavior dependent, characterized by substantial coasting at lower speeds and subsequent re-accelerating with less idling, described as acceleration events, which resulted in high emission rates, while signalized corridors are signal timing dependent, characterized by ample idling with less coasting and re-acceleration, resulting in reduced emission rates. The results also revealed that there was no significant difference between emission rates in the vicinity of the two types of control. Both recorded nearly the same emission rate.Implications: A microscopic simulation approach using VISSIM and MOVES was developed to assess the environmental effect of converting four three-lane roundabouts to signalized intersections along a heavily congested urban corridor in Doha, Qatar. Intersection geometries along with the control type have significant impact on emission rates and play a major role in assessing environmental impacts. US EPA MOVES was calibrated to Qatar conditions which can be used to estimate emission factors and quantify vehicular emissions along other corridors in the country. The results can also be beneficial for other countries within the region.
机译：十字路口的控制类型对任何城市走廊的运行都有重要影响。为了选择最佳的控制类型，可以使用不同的预定义程序来计算一些主要的操作特性，例如容量，延迟和服务水平。但是，还有其他重要因素会影响主要动脉的操作特性，这些因素尚未得到充分解决，例如排放的影响。在这项研究中，开发了一种使用VISSIM和MOVES的微观模拟方法，以评估将四个三车道回旋处转换为沿卡塔尔严重拥挤的城市走廊的信号交叉口的环境影响。决定将所有回旋处切换为交通信号，以实现更好的运营。初步结果表明，信号控制在减少排放37％至43％的范围内胜过环形交叉路口。更详细的分析表明，回旋走廊操作对排放速率的影响与信号走廊的影响不同，尤其是交叉口的上游和下游。立即的环形交叉口上游进近取决于驾驶员行为，其特征在于在较低的速度下大量滑行，随后以较少的空转重新加速，这被描述为加速事件，导致了高排放率，而信号化走廊则取决于信号定时，其特征在于充足的空转。更少的滑行和重新加速，从而降低了排放率。结果还表明，在两种类型的对照附近，排放速率之间没有显着差异。两者的记录率几乎相同。含义：开发了一种使用VISSIM和MOVES的微观模拟方法，以评估将四个三车道回旋处转换为卡塔尔多哈严重拥挤的城市走廊沿信号交叉口的环境影响。交叉口的几何形状以及控制类型对排放率具有重大影响，并且在评估环境影响中起着重要作用。美国EPA MOVES已根据卡塔尔条件进行了校准，可用于估算排放因子并量化该国其他走廊沿线的车辆排放。结果对于该地区的其他国家也可能是有益的。

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