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Continuous Flow Intersection

This presentation discusses the advantages of Continuous Flow Intersections (CFIs) compared to traditional intersections. CFIs provide comparable traffic flow to grade-separated interchanges at a significantly lower cost, yielding long-term benefits. Key points include improved Level of Service (LOS), less delay, increased capacity, and enhanced mainline green time. By analyzing data from current configurations, CFIs demonstrate reduced vehicular wait times and improved overall traffic efficiency. For further inquiries or to understand more about CFIs, contact MoDOT Customer Service at 1-888-ASK-MODOT.

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Continuous Flow Intersection

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Presentation Transcript

  1. Continuous Flow Intersection March, 2007

  2. Why are we here? • Discuss Continuous Flow Intersection compared to Standard Intersection • Update permit status • Answer your questions

  3. What is this and why?

  4. CFI Benefits CFI is an at-grade design that provides comparable levels of vehicular flow to grade-separated interchanges at a fraction of the cost—and dramatic, long-term improvements over conventional at-grade approaches – ABMB Engineers

  5. Benefits of CFI • Improved Level of Service (LOS) • Less Delay • Increased Capacity • More Mainline Green Time • Existing: 80 sec out of 150, 53% • Traditional: 54 sec out of 115, 47% • CFI: 74 sec out of 115, 64%

  6. Benefits of CFI • Provides relief to entire system • 141 @ Gravois (MO 30) • 141 @ Gravois Bluffs • Overall LOS D reduced LOS C • Lower cost than grade separation • More consecutive movements

  7. Level Of Service • Basically, average time each vehicle is stopped at a signal

  8. Level Of Service - 2010 • Existing (current): • LOS C, Delay 24.6 sec/veh • Traditional • LOS D, Delay 35.4 sec/veh • CFI • LOS B, Delay 17.3 sec/veh

  9. Level Of Service - 2030 • 25% Increase in Traffic • Traditional • LOS F, Delay 110.1 sec/veh • CFI • LOS C, Delay 29.5 sec/veh

  10. Level Of Service - 2030 • WB PM Peak Hour - 2,890 veh/hr • Traditional • Delay 110.1 sec/veh => 88.4 hours • CFI • Delay 29.5 sec/veh => 23.7 hours

  11. Consultant’s Conclusion “Both types of intersection configurations studied (continuous flow, dual lefts)…will provide the necessary capacity to accommodate the projected 2010 peak hour volumes. However, the dual left-turn lane concept would operated to LOS F during peak hours, whereas the continuous flow intersection concept would operate at LOS C during these hours. Therefore, the latter configuration would accommodate greater thru traffic volumes along Hwy 30 in the future.”

  12. How Does It Work?

  13. Questions? Contact Information: MoDOT Customer Service 1-888-ASK-MODOT

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