Identification of emission hotspots in roundabouts corridors

Fernandes, Paulo; Salamati, Katayoun; Rouphail, Nagui M.; Coelho, Margarida C.

doi:10.1016/j.trd.2015.04.026

Cited by 23 publications

(14 citation statements)

References 17 publications

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“…The scattered graphs showed that for low spacing values (<200 m), the emissions were approximately 30% higher than those observed for moderate spacing values (~350 m). These findings are in line with previous research conducted in conventional single-lane and multi-lane roundabouts corridors in the US (33). …”

Section: Table 2 Emissions Per Vehicle and Per Kilometer By Segment Asupporting

confidence: 93%

Turboroundabouts Along Corridors: Analysis of Operational and Environmental Impacts

Fernandes

Rouphail

Coelho

2017

Transportation Research Record

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The number of turbo-roundabouts constructed in Europe has grown steadily in the past decade. While there has been extensive work on the operational and environmental impacts of isolated turbo-roundabouts, research on closely-spaced turbo-roundabouts along corridors is somewhat lacking.The objective of this research is to evaluate the impact of turbo-roundabout corridors on both traffic performance and emissions. The research has three major thrusts: 1) to identify the hotspot emission locations along turbo-roundabout corridors; 2) to compare the overall performance of turbo-roundabout corridors against conventional two-lane roundabouts on arterials; 3) to address the integrated effect of geometric and operational characteristics of turboroundabout corridors on carbon dioxide, carbon monoxide, nitrogen oxides and hydrocarbons emissions.Vehicle activity along with traffic flow data were collected from three turbo-roundabout corridors in the Netherlands. Site-specific operations were analyzed using microscopic traffic and emissions platforms (respectively, VISSIM and Vehicle Specific Power -VSP).The results showed that emission hotspots along these corridors occurred in the segments located just downstream of the turbo-roundabout, both in absolute terms (more than 30% of total emissions) and per unit distance. It was also found that the implementation of two-lane roundabout corridors outperformed the turbo-roundabout corridors in terms of vehicle emissions, however the differences were not statistically significant (p-value<0.05). Data analysis indicated that an additional decrease in corridor's emissions (4-11%, depending on the pollutant) may be reached by altering the spacing (from 180 to 240 m) between two-closely spaced turboroundabouts.

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Section: Table 2 Emissions Per Vehicle and Per Kilometer By Segment Asupporting

confidence: 93%

Turboroundabouts Along Corridors: Analysis of Operational and Environmental Impacts

Fernandes

Rouphail

Coelho

2017

Transportation Research Record

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“…Assuming that the driving speed of the vehicle with the right of way amounts to V 1 = 40 km/h and V 2 = V 4 = 25 km/h [20,21], and the zero percent longitudinal slope in the intersection zone, the sight distances defined in accordance with American guidelines amount to d(1) = 45. (Figure 9.e).…”

Section: Analysis Resultsmentioning

confidence: 99%

Ispitivanje preglednosti na izvangradskim jednotračnim kružnim raskrižjima

Ahac¹,

Džambas²,

Dragčević³

2016

JCE

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“…Fernandes et al [28] also investigated the spatial distribution of emissions along a roundabout corridor and identified emission "hotspots" for the cases of equally and unequally spaced intersections. A recent development of this line of research [29] focuses on vehicular emissions along turbo-roundabout corridors in comparison with conventional two-lane roundabout corridors.…”

Section: Literature Reviewmentioning

confidence: 99%

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

Meneguzzer

Gastaldi

Giancristofaro

2018

Journal of Advanced Transportation

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The purpose of this study is to assess the effects on air pollution that may derive from replacing a signal-controlled intersection with a roundabout, using a before-and-after approach. Based on field data collected with a test car instrumented with a Portable Emission Measurement System, the two intersection configurations were compared in terms of emissions of CO 2 , CO, and NO . The existence of significant differences in emissions between the two types of control was assessed by means of a statistical technique known as two-sample biaspect permutation test. In addition, focusing on trips carried out in peak traffic conditions, binary logistic regression models were developed to identify the factors that significantly affect vehicular emissions and to quantify their effect. The findings of our analyses show that emissions of CO 2 and CO are generally lower for the roundabout than for the signal-controlled intersection, while an opposite result arises for NO emissions. As far as other influential factors are concerned, trip direction (reflecting site-specific conditions) and driver behavior have a considerable impact on the emissions of all three pollutants.

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Identification of emission hotspots in roundabouts corridors

Cited by 23 publications

References 17 publications

Turboroundabouts Along Corridors: Analysis of Operational and Environmental Impacts

Turboroundabouts Along Corridors: Analysis of Operational and Environmental Impacts

Ispitivanje preglednosti na izvangradskim jednotračnim kružnim raskrižjima

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

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