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Continuous Flow Intersection. March, 2007. Why are we here?. Discuss Continuous Flow Intersection compared to Standard Intersection Update permit status Answer your questions. What is this and why?. CFI Benefits.
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Continuous Flow Intersection March, 2007
Why are we here? • Discuss Continuous Flow Intersection compared to Standard Intersection • Update permit status • Answer your questions
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
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%
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
Level Of Service • Basically, average time each vehicle is stopped at a signal
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
Level Of Service - 2030 • 25% Increase in Traffic • Traditional • LOS F, Delay 110.1 sec/veh • CFI • LOS C, Delay 29.5 sec/veh
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
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.”
Questions? Contact Information: MoDOT Customer Service 1-888-ASK-MODOT