Case Study: Capacity Characteristics Comparison of Single-lane Roundabout and Turbo-roundabouts

Pitlova, Eva; Kociánová, Andrea

doi:10.1016/j.proeng.2017.06.121

Cited by 14 publications

(4 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…-traffic volume on roundabout circulatory roadway major for vehicle drivers at roundabout entry [E/h] tg -critical gap [s] (Table 3) follow-up time [s] ( In turn, E. Pitlova, A. Kocianova (Slovakia) in the publication [27] compared 2 models of calculation of turbo-roundabouts entry capacity. The first model is based on the Tanner model and has the form:…”

Section: Methodsmentioning

confidence: 99%

A Case Study Analysis of Roundabouts Entry Capacity Localised on One of the Main Road in Sosnowiec City (Poland)

Macioszek¹,

Kurek²

2019

SJSUT.ST

View full text Add to dashboard Cite

This paper is a case study, which among other things includes the analysis of the three roundabouts entry capacity: a turbo-and two spiralroundabouts. These intersections are located in one of the main road localised in Sosnowiec city (Poland). Before reconstruction, this road was characterised by unfavourable road and traffic conditions, insufficient capacity and low traffic safety level. The traffic congestion decreased significantly, traffic and road conditions, as well as the level of road traffic safety, were improved after the rebuilding of this route and the designing of three roundabouts on it. Results obtained from field measurements enabled comparative analysis of theoretical and empirical capacity values: lanes on the entry of turbo-roundabout and entries of the spiral-roundabout. This paper presents also characteristics of turbo-and spiralroundabouts with methods, which are dedicated to entry capacity calculation.

show abstract

Section: Methodsmentioning

confidence: 99%

A Case Study Analysis of Roundabouts Entry Capacity Localised on One of the Main Road in Sosnowiec City (Poland)

Macioszek¹,

Kurek²

2019

SJSUT.ST

View full text Add to dashboard Cite

show abstract

“…They brought advantage in safety, delay, emissions, and fuel savings. In understanding the impacts of roundabouts, numerous research studies have been conducted over time, including performance comparison of turbo and conventional roundabouts [2], single-lane roundabouts [3], safety standards for turbo roundabouts [4], safety at roundabouts with traffic signals [5], turbo roundabouts in comparison to two-lane roundabouts [6], urban scenarios [7], and formulating design principles for turbo roundabouts [8,9].…”

Section: Introductionmentioning

confidence: 99%

Intersection Sight Distance Characteristics of Turbo Roundabouts

Salwan

Easa

Raju

et al. 2021

Designs

View full text Add to dashboard Cite

A turbo roundabout uses spiral circulatory roads for effectively counteracting the problems faced in modern multilane roundabouts. First developed in 1996, the turbo roundabout has an advantage over the conventional roundabout regarding capacity and safety. Turbo roundabouts are still in the developing phase in North America, but even in the European subcontinent where they exist in large numbers, reliable analytical studies on the critical parameters of roundabout visibility are lacking. Visibility (sight distance) helps to shape the geometry of the intersection and aids in safety. This paper presents the mathematical characteristics of the intersection geometry and intersection sight distance (ISD) of the turbo roundabout. Mathematical formulas are presented for the sight distance from the approaching vehicle to the conflicting-entering and circulating vehicles. The maximum lateral clearances to the conflicting vehicles are derived using mathematical optimization. The developed analytical method is verified graphically using AutoCAD. To assist in practical applications, design aids for the maximum lateral clearance are presented. The presented method and design aids should aid in promoting safety at turbo roundabouts.

show abstract

“…Yet another issue is maximising the junction capacity in constrained areas by choosing the appropriate turbo roundabout type. The capacity traffic capacity issue problem has been dealt with by a number of researchers [2,13,[17][18][19][20][21][22][23]. They adopted various hypotheses and simulation models with the purpose of calibrating the already existing methods and adjusting them for various analyses, with the overall objective of demonstrating the superiority of turbo roundabouts over standard roundabouts in terms of traffic handling capacity.…”

mentioning

confidence: 99%

Design Study for the Construction of Turbo Roundabouts under Constrained Site Conditions

Sołowczuk,

Majer

2023

Sustainability

View full text Add to dashboard Cite

Turbo-roundabouts are one of the most frequently recommended road junction design options when it comes to increasing traffic capacity and traffic safety. This is in particular true of suburban areas, with dominant traffic flow on the main road and moderate traffic flow on the side road. Other intersections handling local traffic and considerably constricting the availability of space are usually located in the vicinity of such intersections. Another factor contributing to the limited availability of land for construction in these locations is the presence of surrounding residential housing. Then, choosing the suitable turbo-roundabout type becomes the main issue. The article presents a case study for the selection of a type of turbo roundabout under the conditions of considerably constricted land availability based on the analysis of the provision of a swept path for the chosen design vehicles. The article considers the standard egg-type turbo-roundabouts, “look-a-like” type turbo-roundabouts, non-standard “flattened” turbo-roundabouts and ellipse-based roundabouts, with non-standard geometries of the truck apron and central island. For each of the analysed roundabout types, setting-out methods were described in detail, allowing the designer to quickly select a type of roundabout suitable for the specific constrained site conditions. This article analyses the applicability of non-standard turbo roundabouts for three area types: LUDA low urbanisation degree area, BA built-up area and CDA highly commercially developed area along the side road, wherever standard roundabouts are not practicable due to constraints imposed by existing buildings, canals or any other obstacles found at the project site.

show abstract

Case Study: Capacity Characteristics Comparison of Single-lane Roundabout and Turbo-roundabouts

Cited by 14 publications

References 2 publications

A Case Study Analysis of Roundabouts Entry Capacity Localised on One of the Main Road in Sosnowiec City (Poland)

A Case Study Analysis of Roundabouts Entry Capacity Localised on One of the Main Road in Sosnowiec City (Poland)

Intersection Sight Distance Characteristics of Turbo Roundabouts

Design Study for the Construction of Turbo Roundabouts under Constrained Site Conditions

Contact Info

Product

Resources

About