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Parameterizing V-notch Weir Equations for Flow Monitoring in a Drainage Control Structure
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Modelling the saturation flow rate for continuous flow intersections based on field collected data.

Xing Gao1, Jing Zhao1,2, Meng Wang2

  • 1Department of Traffic Engineering, University of Shanghai for Science and Technology, Shanghai, China.

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|August 7, 2020
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Summary
This summary is machine-generated.

A new model for saturation flow rate at continuous flow intersections (CFI) was developed using field data and the HCM2016 framework. This model helps evaluate CFI performance and mitigate negative impacts on traffic flow.

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Area of Science:

  • Traffic Engineering
  • Transportation Science

Background:

  • Continuous Flow Intersections (CFI) are unconventional designs used globally.
  • Saturation flow rate is critical for CFI geometric design, signal timing, and operational evaluation but has been under-examined.

Purpose of the Study:

  • To establish a saturation flow rate adjustment model for CFI intersections.
  • To analyze the impact of CFI on specific traffic movements.
  • To recommend mitigation strategies for negative impacts on saturation flow rate.

Main Methods:

  • Developed a saturation flow rate adjustment model for CFI based on field data.
  • Utilized the Highway Capacity Manual 2016 (HCM2016) calculation framework.
  • Validated the proposed model, achieving a relative error of less than 10%.

Main Results:

  • The saturation flow rate for left-turn at CFI, through movement at CFI, and left-turn at the pre-signal are decreased due to CFI control.
  • The reduction in saturation flow rate is linked to heavy vehicle ratio, lane changing proportions, and displaced left-turn lane length.
  • The model's validation showed a relative error below 10%.

Conclusions:

  • The developed saturation flow rate model accurately assesses CFI performance.
  • Understanding factors influencing saturation flow rate reduction is key to optimizing CFI operations.
  • Mitigation strategies can be implemented to improve traffic flow at CFIs.