Before-and-After Field Investigation of the Effects on Pollutant Emissions of Replacing a Signal-Controlled Road Intersection with a Roundabout

Meneguzzer, Claudio; Gastaldi, Massimiliano; Giancristofaro, Rosa Arboretti

doi:10.1155/2018/3940362

Cited by 16 publications

(7 citation statements)

References 37 publications

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“…The VERSIT + Enviver emission model [63] shows that small roundabouts reduce NO x by 21% [60]. On the contrary, the studies by [64,65] point out that that vehicles at turbo-roundabouts generated more NO x (12%-19%) than vehicles at the conventional multi-lane roundabouts (depending on the car flow) and 33% more NO x than signalised intersections [59,66]. As can be seen, there is no consensus about the benefits of turbo-roundabouts regarding the available capacity of the intersection.…”

Section: Discussionmentioning

confidence: 99%

Cross-Regional Highway Built through a City Centre as an Example of the Sustainable Development of Urban Transport

Żak

Mainka

2020

Sustainability

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Sustainable development requires ensuring the mobility of residents and must not cause deterioration of the quality of the environment in the selected area. The purpose of this study is to verify if the construction of a cross-regional highway through the city centre affected air quality in the neighbourhood of a newly built road. Air quality was assessed based on measurements of concentrations of nitrogen dioxide, which is considered to be typical for automotive sources air pollution. The spectrophotometric method with passive sampling was used in the 24 h NO2 measurements. The calculated mean NO2 concentrations in the periods before and after road construction were within the ranges of 23.2–31.9 μg/m3 and 22.3–28.9 μg/m3, respectively. The relative NO2 concentrations determined in the study for 10 out of 11 sampling points were lower than the unity, including 5 points markedly lower (0.82–0.89). The obtained results indicate that the construction of the new artery by the city centre, using appropriate technical solutions and traffic organization (tunnel, noise barriers, roundabouts, speed limit) likely contributed to an overall reduction in NO2 concentrations. The presented solution may serve as an example for other cities struggling with problems of low air quality associated with inefficient transportation systems.

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Section: Discussionmentioning

confidence: 99%

Cross-Regional Highway Built through a City Centre as an Example of the Sustainable Development of Urban Transport

Żak

Mainka

2020

Sustainability

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“…Dalam proses kewujudan pencemaran udara trafik di Kuala Lumpur mendapati sebanyak 99.5 peratus penduduk menyatakan bahawa pelepasan bahan pencemar dilepaskan dalam kuantiti yang tinggi daripada ekzos kenderaan di jalan raya bandar (87%) (Jadual 4). Penyampaian jawapan oleh penduduk mengenai lokasi utama pengeluaran bahan pencemar yang tinggi adalah di lebuh raya bandar adalah kurang tepat kerana berdasarkan beberapa kajian terdahulu membuktikan bahawa persimpangan lampu isyarat merupakan tempat yang menyumbang pelepasan bahan pencemar yang tinggi (Kho & Law, 2014;Bing & Zhang, 2016;Kyung-Hwan et al, 2018;Shehadeh, 2018;Meneguzzer et al, 2018;Etim, 2016;Budihardjo et al, 2018;Longinus & John, 2016). Hal ini menunjukkan bahawa penduduk di Kuala Lumpur pengetahuan penduduk berada pada tahap sederhana melalui beberapa persepsi yang diberikan adalah kurang tepat.…”

Section: Metod Kajianunclassified

Pengetahuan dan kesedaran penduduk terhadap pencemaran udara trafik di Kuala Lumpur, Malaysia

Shafie¹,

Geografi²,

Mahmud³

2021

GEOGRAFIA

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According to a report by the Department of Environment, motor vehicles are the leading cause of high pollutants in Kuala Lumpur. The seriousness of the traffic pollution problem in Kuala Lumpur is also influenced by the level of knowledge, attitude and awareness of the people regarding the process and impact of the traffic pollution. The level of knowledge and awareness of Kuala Lumpur residents on traffic pollution was assessed using descriptive statistical analysis involving 200 residents through simple random sampling in six strategic zones of Kuala Lumpur namely City Centre, Wangsa Maju-Maluri, Sentul-Menjalara, Damansara-Penchala, Bukit Jalil-Seputeh dan Bandar Tun Razak-Sungai Besi. The results show that the level of knowledge and awareness of the population is modest, that is, more than 50 percent of the population shows positive perception in two aspects, namely basic knowledge of traffic pollution (above 55 percent of respondent) and negative impact of air pollution on human health (more than 70 percent of respondent). However, other aspects such as the process of the existence of traffic pollution and the quality of gasoline fuel such as RON show that only 58 percent of population in Kuala Lumpur known about the RON and 42 percent of population does not understand in detail through some given incorrect and inaccurate answers. As a result, population understanding and awareness of traffic air pollution problem is very important to control and reduce the negative on health and quality of population life. Cooperation between the authorities and policy makers is necessary in the implementation of the strategy and introduction of various incentives to the population aimed at controlling and reducing the negative impact of traffic pollution and at the same time offering environmental protection and making environmental health policy more targeted and effective in the city of Kuala Lumpur.

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“…In the last two decades, roundabouts have become the most common and efficient solution for at-grade intersections [1][2][3][4][5]. However, many papers have evinced that standard multi-lane roundabouts offer lower capacity compared to estimates and a high rate of crashes [6,7].…”

Section: Introductionmentioning

confidence: 99%

Safety Improvements by Converting a Standard Roundabout with Unbalanced Flow Distribution into an Egg Turbo Roundabout: Simulation Approach to a Case Study

Gallelli

Vaiana

2019

Sustainability

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In 2011, the United Nations Road Safety Collaboration (UNRSC) developed a Global Plan for the Decade of Action for Road Safety 2011–2020. Among the categories or “pillars” of activities, is the improvement of road safety for infrastructures. Furthermore, this plan is aligned by the UN Sustainable Development Goals that included even traffic safety. In this regard, this study estimates safety improvements achieved by converting a standard roundabout into an egg turbo roundabout. In particular, turbo roundabouts have become very popular in Northern Europe for both their safety and their capacity. Many studies have shown these advantages thanks to their features: preventive separation of entering flows, limited lane changing and low speeds due to curbs. Given the absence of existing turbo roundabouts in Italy, this research studied and compared a “virtual” roundabout with spiraling circular carriageways to an existing multi-lane roundabout in order to assess its significant reduction in terms of potential collisions. This study relied on traffic conflicts in micro-simulation by using VISSIM software and then Surrogate Safety Assessment Model (SSAM). The research is based on the traffic process observed at a standard roundabout in Cosenza (Italy) marked by a high level of congestion and safety problems. Speeds, critical gaps, queue lengths, and floating car data, obtained from video observations, have been used as input data for the calibration procedure of the first scenario (case study roundabout). Then, the turbo roundabout solution was built and simulated by using the previously derived parameters. Finally, the two roundabout scenarios were compared in terms of spatial distribution of the potential conflicts determined by SSAM. The results could help to measure the performance and safety impact of these two roundabout configurations.

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Before-and-After Field Investigation of the Effects on Pollutant Emissions of Replacing a Signal-Controlled Road Intersection with a Roundabout

Cited by 16 publications

References 37 publications

Cross-Regional Highway Built through a City Centre as an Example of the Sustainable Development of Urban Transport

Cross-Regional Highway Built through a City Centre as an Example of the Sustainable Development of Urban Transport

Pengetahuan dan kesedaran penduduk terhadap pencemaran udara trafik di Kuala Lumpur, Malaysia

Safety Improvements by Converting a Standard Roundabout with Unbalanced Flow Distribution into an Egg Turbo Roundabout: Simulation Approach to a Case Study

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