He Qinghua, Meng Yuanying, Tan Wang, Tian Xin, Liu Shangru, Yang Hang, Shao Yang, Pan Binghong
Highway School, Chang' an University, Xi'an, China.
Guangzhou Expressway Co., Ltd, Guangzhou, China.
Heliyon. 2024 Feb 20;10(4):e26372. doi: 10.1016/j.heliyon.2024.e26372. eCollection 2024 Feb 29.
The construction of cities and economic development lead to more and more serious environmental pollution, and the concept of green and low-carbon city has been proposed. Therefore, a series of requirements have been put forward for transportation. CO and other pollutants will be produced in the exhaust of conventional fuel vehicles, which will seriously affect the urban environment, especially at intersections with large passenger and vehicle flows. When multiple roads, especially more than 4 roads, intersect on urban roads, traffic organization can usually be achieved by using a roundabout. However, due to the limited capacity of the conventional roundabout, with the rapid increase of the traffic volume, and there are many vehicles in the circle lane change and interweaving behavior. This has caused serious congestion at the roundabout, the significantly increase in pollutants emissions and the decline in air quality. As an unconventional design, the turbo roundabouts use canalized traffic to allowed drivers to select the appropriate lanes in advance depending on their destinations so that different lanes within the circle do not interfere with one another, which improves the safety of the intersection while ensuring capacity. The main purpose of this paper is to analyze the traffic efficiency and safety of the conventional roundabout scheme and turbo roundabout scheme for five-way intersections. Using VISSIM to simulate different forms of roundabout and analyzing the six selected evaluation indicators. The number of vehicles in different entrance lanes and the diameter of the circle are selected as sensitivity factors for sensitivity analysis. Finally, the factor analysis method (FAM) is used to classify the six indicators into two categories: traffic efficiency and traffic safety, so as to comprehensively evaluate the different schemes. The results show that the difference in performance between the two schemes was not significant at low traffic volumes. At high traffic volumes, the turbo roundabout was better than the conventional roundabout in terms of emissions, safety and throughput efficiency. CO emissions from vehicles on conventional roundabout are generally higher than those on turbo roundabout, up to 53.62%. Therefore, the turbo roundabout is more appropriate for heavy traffic conditions.
城市建设和经济发展导致环境污染日益严重，绿色低碳城市的概念应运而生。因此，对交通提出了一系列要求。传统燃油车辆尾气中会产生一氧化碳等污染物，这将严重影响城市环境，尤其是在客货流量大的路口。当城市道路上多条道路相交，尤其是4条以上道路相交时，通常可采用环形交叉来实现交通组织。然而，由于传统环形交叉的通行能力有限，随着交通量的快速增长，环形车道内车辆变道和交织行为频繁。这导致环形交叉处严重拥堵，污染物排放量大幅增加，空气质量下降。作为一种非常规设计，涡轮环形交叉采用渠化交通，使驾驶员能够根据目的地提前选择合适的车道，从而使环形内不同车道互不干扰，在保证通行能力的同时提高了交叉路口的安全性。本文的主要目的是分析五路交叉路口传统环形交叉方案和涡轮环形交叉方案的交通效率和安全性。利用VISSIM模拟不同形式的环形交叉，并分析六个选定的评价指标。选择不同进口车道的车辆数和环道直径作为敏感性因素进行敏感性分析。最后，采用因子分析法（FAM）将六个指标分为交通效率和交通安全两类，以便对不同方案进行综合评价。结果表明，在低交通量时，两种方案的性能差异不显著。在高交通量时，涡轮环形交叉在排放、安全和通行效率方面优于传统环形交叉。传统环形交叉上车辆的一氧化碳排放量普遍高于涡轮环形交叉，最高可达53.62%。因此，涡轮环形交叉更适合交通繁忙的情况。
