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In scenarios involving parallel transformers with disparate ratings, developing per-unit models requires accommodating off-nominal turns ratios. This situation arises when the selected base voltages are not proportional to the transformer’s voltage ratings. Consider a transformer where the rated voltages are related by the term a. If the chosen voltage bases satisfy a relationship involving term b, term c is defined as the ratio of these bases. This ratio is then substituted into the...
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Enhancing Intersection Efficiency: A Comparative Analysis of Converting Single-Lane Roundabout to Turbo Roundabout.

Kristián Čulík1, Alica Kalašová1, Peter Fabian1

  • 1Department of Road and Urban Transport, University of Žilina, Univerzitná 1, 01026 Žilina, Slovakia.

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Summary
This summary is machine-generated.

Turbo roundabouts (TR) show improved traffic flow, reducing delays and queues compared to single-lane roundabouts (SLR). However, benefits depend on traffic volume and may decrease with high flows or significant pedestrian and cyclist activity.

Keywords:
intersectionmicrosimulationsafetytraffic engineeringtraffic flowturbo roundabout

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Area of Science:

  • Civil Engineering
  • Transportation Engineering
  • Traffic Safety

Background:

  • Single-lane roundabouts (SLR) are common but can experience operational challenges.
  • Turbo roundabouts (TR) are an alternative design aiming to improve traffic flow and safety.
  • Evaluating the comparative performance of SLR and TR designs is crucial for traffic management.

Purpose of the Study:

  • To compare the operational and safety performance of a conventional single-lane roundabout (SLR) and a turbo roundabout (TR).
  • To assess the effectiveness of a TR conversion in improving traffic conditions at a specific intersection.
  • To analyze the impact of traffic volumes and patterns on the performance of both roundabout types.

Main Methods:

  • A mixed-methods approach combining field traffic data collection and microsimulation modeling.
  • Capacity calculations based on national guidelines (TP 100 and TP 102).
  • Development and validation of a calibrated microsimulation model to compare SLR and TR designs under peak-hour conditions.

Main Results:

  • The turbo roundabout (TR) design demonstrated reduced average delays and queue lengths compared to the single-lane roundabout (SLR).
  • The TR design effectively eliminated internal weaving conflicts observed in the SLR.
  • Performance benefits of TR are conditional, influenced by traffic volumes, turning-movement patterns, and pedestrian/cyclist interactions.

Conclusions:

  • Turbo roundabouts (TR) offer potential operational improvements over single-lane roundabouts (SLR) under specific traffic conditions.
  • The effectiveness of TR designs is contingent upon traffic characteristics and the integration of vulnerable road users.
  • Further research is needed to understand the full applicability and limitations of TRs in diverse traffic environments.