Continuous Flow Intersection

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Continuous Flow Intersection

• March, 2007

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Why are we here?

• Discuss Continuous Flow Intersection compared to
  Standard Intersection
• Update permit status
• Answer your questions

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What is this and why?
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(No Transcript)
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CFI Benefits

• CFI is an at-grade design that provides
  comparable levels of vehicular flow to
  grade-separated interchanges at a fraction of the
  costand dramatic, long-term improvements over
  conventional at-grade approaches ABMB
  Engineers

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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

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Benefits of CFI

• Provides relief to entire system
• 141 _at_ Gravois (MO 30)
• 141 _at_ Gravois Bluffs
• Overall LOS D reduced LOS C
• Lower cost than grade separation
• More consecutive movements

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Level Of Service

• Basically, average time each vehicle is stopped
  at a signal

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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

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Level Of Service - 2030

• 25 Increase in Traffic
• Traditional
• LOS F, Delay 110.1 sec/veh
• CFI
• LOS C, Delay 29.5 sec/veh

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Level Of Service - 2030

• WB PM Peak Hour - 2,890 veh/hr
• Traditional
• Delay 110.1 sec/veh gt 88.4 hours
• CFI
• Delay 29.5 sec/veh gt 23.7 hours

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Consultants 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.

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How Does It Work?
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Questions?

• Contact Information
• Kristy Yates, Area Engineer, 314-340-4291
• Ryan Pierce, Traffic, 314-340-4562
• Jacqueline Jone, Traffic, 636-225-7149
• Jill Steiger, Permits, 314-340-4332
• Jeanne Olubogun, Traffic Studies, 314-340-4550