An Analysis of Turbo Roundabouts from the Perspective of Sustainability of Road Transportation

Petrů, Jan; Krivda, Vladislav

doi:10.3390/su13042119

Cited by 14 publications

(6 citation statements)

References 29 publications

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“…However, all the existing design guidelines listed in Table 1 [5,15,16,19,24,27,28,32] apply to roundabouts with approaches oriented to each other at a right angle. Similar comments can be noted with regard to the publications shown in Table 1, concerning the analysis of the driving corridors of selected design vehicles and, consequently, the lane widths of the turbo-roundabout and the entry and exit radii [24,25,29,30,33,34].…”

Section: Country Year Brief Overview Of Recommendations In Selected G...supporting

confidence: 69%

Design of Turbo-Roundabouts Based on the Rules of Vehicle Movement Geometry on Curvilinear Approaches

Sołowczuk,

Benedysiuk

2023

Sustainability

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The construction of turbo-roundabouts is an increasingly frequent choice when it comes to improving flow capacity and traffic safety at road intersections. The existing design guidelines, as a rule, give parameters for turbo-roundabouts with approaches set at right angles to each other. The article presents turbo-roundabout design methods, taking into account swept path analyses of the chosen design vehicles when the approach legs are curvilinear and oriented to each other at a non-right angle. Based on the analysis of three different design vehicles, it was proven that their swept paths have a major influence on the geometrical parameters of the roundabout and, consequently, on the land take area, i.e., they can significantly impact the project’s construction costs. In the case of curvilinear approaches, which are oriented to each other at a non-right angle, it is impossible to impose on the designer specific values of the circulatory lane widths and the entry and exit curve radii as they depend primarily on the chosen design vehicle. The aim of the article was to demonstrate that in the case of the curvilinear approach on the Basic type turbo-roundabout, the design process should include the swept path analysis for the chosen design vehicle for each of the approaches. This should lead to the design of wider swept paths and higher curve lane divider entry and exit radii.

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Section: Country Year Brief Overview Of Recommendations In Selected G...supporting

confidence: 69%

Design of Turbo-Roundabouts Based on the Rules of Vehicle Movement Geometry on Curvilinear Approaches

Sołowczuk,

Benedysiuk

2023

Sustainability

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“…These included research into the types of transported cargoes, identification of sources and destinations of transports, as well as video analysis of monitored transports using a system of video cameras, a drone [12,33] and a floating vehicle, similarly as in [37]. The acquired records were also processed using digital image analysis [20,33,[39][40][41]. Furthermore, measurements using GPS technology were used [11] and software models of vehicles were created to determine (verify) the parameters similarly as in [42], which would ensure the passage of transports on roads (the issue is described in more details in the following publications [11,12,33]).…”

Section: Introductionmentioning

confidence: 99%

The Transport of Oversized Cargoes from the Perspective of Sustainable Transport Infrastructure in Cities

Petrů

Krivda

2021

Sustainability

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The article deals with the transport of oversized cargoes from the perspective of parameters of road network in city environments. In recent years, there has been an increase in the transport of products with dimensions and weight considered above standard. It is very difficult to transport these products not only within Europe but also worldwide. This is also pointed out in the European directive, which recommends that all EU member states build a pan-European network of corridors for the transport of oversized cargoes. The article analyses the issue of transport within the transport infrastructure in cities from the perspective of sustainability of road networks for ensuring the passage of oversized cargoes. The article describes the results of research that was performed for the determination of parameters to ensure the passage of oversized cargoes on roads. The article also deals with the analysis of implemented transports, the results of video analysis of monitored transports, measurement of swept paths of vehicles using GPS apparatus and drones, modelling of oversized vehicles in programs for verification of the swept paths of vehicles, simulation of passage of oversized cargo, the determination of values of radii of corners, widths and heights for the transport of cargoes and the distance from solid obstacles. The precondition for the above-mentioned outputs is the practical use of results in planning the transport infrastructure on the entire communication network and the possibility of its application for designing activities associated with the construction or reconstruction of intersections on routes of frequent transport of excessive and oversized cargoes and verification of critical points on the route. The outputs of the work serve as a basis for the processing of technical conditions, which include procedures and technical recommendations within the design practice in the Czech Republic but also abroad. Emphasis is placed on sustainable, safe and economic transport infrastructure.

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“…6. A microscopic model of an oval turbo-roundabout created and calibrated in the PTV Vissim within the case studies [19,26,27] was used for these purposes. Simple traffic conditions at a singlelane minor entry within this model were simulated, specifically: the total entry traffic volume of 600 veh/h with a different right-turning proportion R = 10 %, R = 50 %, R = 90 %, and the total circulating traffic volume of 1 000 veh/h with an equal traffic flow redistribution into the outer and inner circulatory lanes.…”

Section: Evaluation Of Mixed Traffic Flow Capacity On a Shared Entry Lanementioning

confidence: 99%

Capacity Model for Single-Lane Minor Entry at Turbo-Roundabouts

Kociánová

2021

Civil and Environmental Engineering

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Spirally arranged and physically separated traffic lanes in the circulatory carriageway of turbo-roundabouts force drivers to choose a particular entry lane and, subsequently, a circulatory traffic lane according to their intended destination. This specificity is taken into account in theoretical capacity models for two-lane turbo-roundabout entries typically evaluated by the lane-by-lane approach. Nevertheless, this specific path of movements is not considered in the most widely used capacity models for single-lane minor entries at oval turbo-roundabouts. In these models, only one entering traffic flow conflicted by two circulating traffic flows in front of the entry is considered. However, the entering traffic flow presents a mixed traffic flow of two movements (right-turning movement and left-turning and through movement) with different capacities due to different number of conflicting traffic streams and traffic volumes allocated into the outer and the inner circulatory lane. This fact is included in the capacity estimation for a single-lane minor entry presented in the article using the existing capacity formula for the mixed traffic flow on a shared minor lane at unsignalized intersections. The entry capacity reflects the proportion of the right-turning movement within a shared entry lane as well as the specific allocation of circulating traffic flow into the outer and the inner circulatory lane. This entry capacity is about 10 % to 30 % higher compared to a single-lane entry capacity estimated according to commonly used models described in the article. Higher entry capacity in a higher proportion of the right-turning traffic within mixed entry traffic flow is confirmed also by the results of average delays estimated by the theoretical delay model and microsimulation.

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An Analysis of Turbo Roundabouts from the Perspective of Sustainability of Road Transportation

Cited by 14 publications

References 29 publications

Design of Turbo-Roundabouts Based on the Rules of Vehicle Movement Geometry on Curvilinear Approaches

Design of Turbo-Roundabouts Based on the Rules of Vehicle Movement Geometry on Curvilinear Approaches

The Transport of Oversized Cargoes from the Perspective of Sustainable Transport Infrastructure in Cities

Capacity Model for Single-Lane Minor Entry at Turbo-Roundabouts

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