Influence of roundabout capacity enhancement on emission production

Kociánová, Andrea; Drličiak, Marek; Pitlova, Eva

doi:10.1088/1757-899x/236/1/012035

Cited by 7 publications

(3 citation statements)

References 2 publications

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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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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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“…The data reflect changes of the traffic flow characteristics depending on design, [16]. Six simulation series were carried out using the model, each one corresponding to a particular radius size and a corresponding speed on a turn (of maximum and minimum size).…”

Section: Right Turnsmentioning

confidence: 99%

Influence of Selected Vehicle Maneuvers on Reduction of the Urban Roads Capacity

Celko¹,

Kováč²,

Huszarova³

2019

Komunikácie

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Capacity assessment of urban roads according to Slovak standard does not sufficiently take into account the influence of vehicle maneuvers on road section performance between the two intersections. This research analyzed turning relations on selected urban road intersections and the influence of right turn and left turn on major stream speed changes. For the purpose of determining the influence of the right turn on decrease in capacity, measurements were carried out at 7 uncontrolled intersections with curve radius ranging from 6 to 30m. To determine the influence of the left turn on the capacity of urban road a critical gap was evaluated, using the Raff’s, method, based on the analysis of accepted and rejected gaps in the major traffic stream, which was one of the main inputs for simulations. The findings were used to determine the influence of selected maneuvers on the road capacity, which led to a proposal for reduction coefficients based on computational analysis performed using simulations in PTV VISSIM.

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“…In some European countries (e.g., the Netherlands, Poland, Hungary), this type of roundabout is quite common; in other countries (e.g., Austria, the Czech Republic, Slovenia, Slovakia), turbo-roundabouts are quite rare. However, Slovenia and other countries have a number of experts who address this issue from various professional perspectives [33,[35][36][37][38][39][40], and as a result, the number of turbo-roundabouts is increasing.…”

Section: Introductionmentioning

confidence: 99%

An Analysis of Traffic Conflicts as a Tool for Sustainable Road Transport

et al. 2020

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This paper presents an approach to partially solving an issue within the scope of sustainable road transport, specifically the issue of potential accidents, i.e., traffic conflicts. First, a method is introduced for the analysis of traffic conflicts using video equipment. The attention is focused on traffic conflicts that occur at turbo-roundabouts. Given the diversity of causes of traffic conflicts, the emphasis is placed on the correct identification of the cause, i.e., whether the conflict is caused only by the negligence of the road user, or whether the conflict is more or less influenced by an inappropriately designed turbo-roundabout or one or more of its specific building elements (e.g., unsuitable corner radius). The next part of the article presents a selection of results that were obtained from analyses performed at about 100 turbo-roundabouts in nine European countries. Illustrative diagrams show the courses of the emergence of traffic conflicts, the causes of which are then described in detail. The conclusions from these analyses confirm the main hypothesis that the evaluation of traffic conflicts should be an essential part of designing roads, in order to increase traffic safety and, importantly, contribute to sustainable transport.

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Influence of roundabout capacity enhancement on emission production

Cited by 7 publications

References 2 publications

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

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

Influence of Selected Vehicle Maneuvers on Reduction of the Urban Roads Capacity

An Analysis of Traffic Conflicts as a Tool for Sustainable Road Transport

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