Performance Analysis of Basic Turbo-Roundabouts in Urban Context

Corriere, Ferdinando; Guerrieri, Marco

doi:10.1016/j.sbspro.2012.09.912

Cited by 35 publications

(24 citation statements)

References 5 publications

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“…Nevertheless, site-traffic conditions and geometric layouts tend to influence the overall performance of turbo-roundabouts (7; 11). Corriere and Guerrieri (8) explain that each approach capacity at turbo-roundabouts depends on lane capacity, conflicting traffic flows, pedestrian activity, driving habits and the balance of traffic demand on each approach. Vasconcelos et al (12) stated that turbo-roundabout can only reach comparable capacity levels to the traditional two-lane layout when the proportion of right-turning traffic is unusually high (>60%).…”

Section: Literature Reviewmentioning

confidence: 99%

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: Literature Reviewmentioning

confidence: 99%

Turboroundabouts Along Corridors: Analysis of Operational and Environmental Impacts

Fernandes

Rouphail

Coelho

2017

Transportation Research Record

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“…If we consider the specialization in entry lanes as well as the diverse values of entry and confl icting fl ows, it is necessary to estimate lane capacities separately. Therefore, the methodological approach to determine entry capacities is similar to the one adopted in turbo roundabouts [6,7,8] which requires a lane by lane analysis owing to the physical separation of traffi c lanes. More recently, the Manual HCM 2010 [9] has extended the lane-by-lane analysis method to traditional roundabouts, thus conforming to Akçelik's research results [10].…”

Section: Lane Capacity Computationsmentioning

confidence: 99%

Estimation of Air Pollutant Emissions in Flower Roundabouts and in Conventional Roundabouts

Corriere

Guerrieri

Ticali

et al. 2013

Archives of Civil Engineering

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The road pollutant emissions, above all in urban context, are correlated to many infrastructural parameters and to traffi c intensity and typology. The research work on road junction geometry, carried out in European research centres, has recently allowed to design new road intersection types which are of undoubted interest, especially in terms of traffi c functionality and safety, like the fl ower roundabouts (in which right-turn manoeuvres do not confl ict with the circulating fl ow). The main objective of this paper is to propose a model for the estimation the capacity, delay, levels of service and the pollutant emissions into fl ower roundabouts. A comparative analysis between conventional roundabout and fl ower roundabout has been carried out in terms of CO, CO 2 , CH 4 , NO, PM 2,5 and PM 10 vehicular emissions, evaluated by mean of COPERT Software which is developed as a European tool for the calculation of emissions from the road transport sector.

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“…After obtaining the entry lane capacity of a slip lane, by denoting the saturation degrees (entry flow/capacity ratio) with x, the entry capacity (C E ped ) can be estimated through the following relation (Mauro & Branco, 2010;Corriere & Guerrieri, 2012;Giuffrè et al, 2012): , ,…”

Section: Total Entry Capacitymentioning

confidence: 99%

Right-turn Bypass Lanes at Roundabouts: Geometric Schemes and Functional Analysis

Mauro¹,

Guerrieri²

2012

MAS

Self Cite

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Right-turn bypass lanes can be implemented in conventional and innovative roundabout intersections to increase the capacity and improve the global functional performances. The Right-turn bypass lanes (also called slip lanes) can be distinguished according to the planimetric layout and the entry control type (stop, yield slip or Free Flow acceleration lane). This paper presents a closed-form model for the estimation of capacity, delays and level of service of roundabout equipped with Right-turn bypass lanes, considering the effect of geometric slip lane schemes, control type, vehicular and pedestrian flow. In order to examine the traffic conditions which can benefit from slip lane roundabouts in terms of capacity and delays, compared to traditional schemes which have no additional lanes, a great number of analyses have been carried out by considering different O/D matrices and vehicle and pedestrian flow vectors. Such comparisons have been made by considering the control delays in function of different O/D matrices. Such O/D matrices describe the most significant situations of traffic demand which can be of interest for the road intersections under study.

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Performance Analysis of Basic Turbo-Roundabouts in Urban Context

Cited by 35 publications

References 5 publications

Turboroundabouts Along Corridors: Analysis of Operational and Environmental Impacts

Turboroundabouts Along Corridors: Analysis of Operational and Environmental Impacts

Estimation of Air Pollutant Emissions in Flower Roundabouts and in Conventional Roundabouts

Right-turn Bypass Lanes at Roundabouts: Geometric Schemes and Functional Analysis

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