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Rui Yue Center for Advanced Transportation Education and Research University of Nevada, Reno

An Evaluation of Operational Efficiency Between Single Point Urban Interchange with Frontage Road and Tight Diamond Interchange. Rui Yue Center for Advanced Transportation Education and Research University of Nevada, Reno June 25th, 2019. Contents. Motivation Case Study

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Rui Yue Center for Advanced Transportation Education and Research University of Nevada, Reno

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  1. An Evaluation of Operational Efficiency Between Single Point Urban Interchange with Frontage Road and Tight Diamond Interchange Rui Yue Center for Advanced Transportation Education and Research University of Nevada, Reno June 25th, 2019

  2. Contents • Motivation • Case Study • Evaluation Methodology • VISSIM Simulation • Results Analysis • Conclusion

  3. Motivation • Single Point Urban Interchange (SPUI) and Tight Diamond • Interchange (TDI) • Have been fully evaluated • Operational efficiency • Single Point Urban Interchange with Frontage Road (SPUI-F) • Existed in Reno • Story • Has not been fully investigated • Lack of research to compare the efficiency of TDI and SPUI-F

  4. Reno SPUI-F

  5. Reno TDI

  6. Methodology • Road Network Model • From the field • Easy to calibrate • Volume Design • Base volume • Sensitivity test (5) • Seven Scenario Groups (7) • 35 cases for both interchanges • Evaluation • Average Delay • Average Speed • Average Queue Length

  7. Simulation • SPUI-F • TDI

  8. Results Analysis

  9. Results Analysis

  10. Discussion • What if TTI four phase was not used? • Other variations?

  11. Conclusion • TDI outperformed SPUI-F • Average delay: about 35% improved. • Average speed :12% improved. • Average queue length :60% improved. • TDI has better reliability than SPUI-F • Range of average delay: TDI(8.35s) < SPUI-F(24.7s) • Range of average speed: TDI(1.48mph) < SPUI-F(4.03mph) • Range of average queue length: TDI(21.05ft)<SPUI-F(71.04ft) • TDI is better than SPUI-F

  12. Thank you!

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