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The Basics of CFI ABMB CFI.avi

Continuous Flow Intersection Update (Airline @ Siegen) 60th Annual Missouri Traffic and Safety Conference. The Basics of CFI ABMB CFI.avi. At-Grade Intersection Left-turns happen in advance of the main intersection Movements occur simultaneously This eliminates phases from the signal

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The Basics of CFI ABMB CFI.avi

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  1. Continuous Flow Intersection Update(Airline @ Siegen)60th Annual Missouri Traffic and Safety Conference

  2. The Basics of CFIABMB CFI.avi • At-Grade Intersection • Left-turns happen in advance of the main intersection • Movements occur simultaneously • This eliminates phases from the signal • More capacity  Less Congestion • Intuitive to drivers (turn left to go left) • Many possible configurations

  3. CFI Efficiency 650 650 650 650 Conventional 4-lane roadway 650 v/l/h x 4 lanes = 2600 v/h C=150 P.M. Peak

  4. CFI Efficiency 650 650 650 650 Conventional 4-lane roadway 650 v/l/h x 4 lanes = 2600 v/h C=150 P.M. Peak 850 850 850 850 CFI 4-lane roadway 850 v/l/h x 4 lanes = 3400 v/h C=120 P.M. Peak

  5. Some History • Concept Developed over 25 Years Ago • Featured in Numerous Research Efforts & Publications • Over 60 Currently Operating • AASHTO’s 2002 National Award for Innovation

  6. More History • 2002 -- LADOTD and ABMB Began Discussing Possible CFI Applications • Construction of the Airline / Siegen CFI Began in the Summer of 2005 • Then …

  7. Katrina… Katrina...

  8. Katrina Effects • Construction Delayed for Several Months • Influx of Temporary and Permanent Residents • 24-Hour Counts Still +19%Over Pre-CFI Volumes • Peak Hour Counts Increased Erratically

  9. Design Volumes(Projected 2004) 5845 6489 951 1766 846 2366 17% 20% Airline Hwy. 57 428 361 104 537 310 82% 25% -14% Airline Hwy. Free 1638 128 Free 1913 153 Siegen Lane Sherwood Forrest Siegen Lane Sherwood Forrest 592 575 432 -42% 16% -24% 342 667 327 327 1022 285 317 1201 318 -3% 18% 12% 1634 1336 1599 1836 Post – Katrina Volumes(May 8, 2007)

  10. March 21, 2006 – Opening Day

  11. The Bad News The Good News • Operations Greatly Improved • Travel Times down 40% • Average Delay Less than ½ Previous • Driving Public Satisfaction • Safety • Actual Volumes Much Higher Than Design Volumes • Katrina • “Avoiders” Returned to Intersection • Unbalanced Increases Made Timing Adjustments Challenging

  12. Cumulative Accident Data: Twelve Month Period (March-March)

  13. Cumulative Accident Data: Six Month Period (March-September)

  14. Preliminary Safety AnalysisTotal Accidents Down 25%Serious Accidents Down 34%

  15. Misconceptions • Confusing to Drivers • What if the Power Goes Out?

  16. Public Acceptance

  17. Day Before Opening

  18. 4 months later

  19. The Advocate 05.20.2006

  20. The Advocate 07.11.2006

  21. Public Acceptance Survey

  22. Public Acceptance Survey Question 3a: State below whether you think the improvements make TRAFFIC CONGESTION Better, Worse, or the Same…

  23. Public Acceptance Survey Question 5. Please indicate your level of satisfaction with the current traffic conditions of the intersection. 92% Satisfied

  24. LADOTD CFI Task Force • Formed to evaluate this and future CFI’s • Comprised of key LADOTD department heads, FHWA, City, Law Enforcement and consultant • The study looks at Operational Performance, Design Elements, Safety and Public Acceptance • Final report coming soon (3 months +/-) FHWA Unconventional Intersection Study • Study will evaluate operational performance, safety and driver behavior for 3 unconventional intersections: 1. CFI – Airline at Siegen, Baton Rouge, Louisiana, opened March 2006 2. CFI – Bangerter at 3500 South, Salt Lake City Utah, construction starts early 2007 3. DDI – Kansas City, Missouri

  25. Where is CFI Today? • Louisiana – 1 Open, 8 studied or currently under study • Airline Highway at Siegen Lane (Open) • Airline Highway at Goodwood, Old Hammond, Bluebonnet, Jefferson • Florida Boulevard at Sherwood Forest Boulevard • Alexandria Traffic Circle • Ambassador Caffrey Parkway at Johnston Street • Statewide Study on-going, All Districts (90+ Intersections) • Maryland – 1 operational, 6 studied or currently under study MD 228 at MD 210 (operational) • MD 140 Corridor Study – 7 intersections / 3 CFI’s • US 29 at Stewart Lane / Eden Lane • MD 140 at Painters Mill Road • MD 213 at US 40

  26. Mississippi – 1 Under Construction, 1 Under Design • US 61 at Junkin Drive (Under construction, 2010 Opening) • US 49 at State Route 53 (Final Plan Stage) • US 61 at Devereaux Road • Jackson at State Route 6 • Ohio – 1 Under Construction, 1 Under Design, 5 studied or currently under study • Austin Pike at State Route 741 (Under Construction) • Beachmont at 5-Mile (Preliminary Design) • Columbus Pike at Powell Road • Brice Road at Scarborough / Tussing Boulevard • State Route 32 at Glenestre • State Route 32 at Bells Lane • State Route 32 at Baur Road • Utah – 1 Open to Traffic Bangater Hwy at 3500 South • Arkansas - 1 studied Shackleford Highway at I-630 / Financial Center Parkway Statewide Study on-going

  27. Questionswww.abmb.com Laurence Lambert, P.E., PTOE llambert@abmb.com

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