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SASHTO 2009

SASHTO 2009. Innovative Intersections. Update on the Continuous Flow Intersection (CFI). Peter Allain, PE, PTOE Louisiana Department of Transportation and Development. CFI Update. Background Theory Safety Capacity Right of way and Access Operation Public Opinion. Background.

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SASHTO 2009

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  1. SASHTO 2009 Innovative Intersections

  2. Update on the Continuous Flow Intersection (CFI) Peter Allain, PE, PTOE Louisiana Department of Transportation and Development

  3. CFI Update • Background • Theory • Safety • Capacity • Right of way and Access • Operation • Public Opinion

  4. Background • Airline Highway at Siegen/S. Sherwood Forrest • Let to contract November 2004 at a cost of $4.4M • Hurricane Katrina August 2005 • Open to traffic March 2006 • Accepted November 2006

  5. Theory • Actually a Displaced Left-Turn Lane Intersection (DLTLI?) • Left-turning traffic crosses over opposing lanes to the left side of the roadway in advance of the main intersection. • The turn to the cross street can then be made at the same time as the main thru movements. • Partial CFI

  6. Existing Intersection

  7. CFI Design – Same basic moves

  8. Displaced Left-turns

  9. Safety Traditional Intersection 32 Conflict Points Partial CFI 30 Conflict Points

  10. Crashes

  11. 5845 1766 846 57 428 361 Free 1638 128 592 575 432 327 1022 285 1634 1599 Capacity – 2004 peak North

  12. Volumes

  13. Volume trends

  14. Right of way and Access

  15. Right of Way and AccessBEFORE AFTER

  16. Operation • Power Failures • Timing • Signing

  17. Operation - Signing

  18. Operation - Timing

  19. Operation - Timing

  20. Public Opinion

  21. PublicOpinion Survey Question 5. Please indicate your level of satisfaction with the current traffic conditions of the intersection. 92% Satisfied

  22. CFI Update • Safety – • So far looks good, but not conclusive • No issues with wrong way at crossovers • Capacity – • Fewer phases • CFI’s do have limits • Right of way and Access – • Very wide width • Access issues

  23. CFI Update (continued) • Operation • Complex • Needs to be engineered • Public Opinion • Very good acceptance • No problems with misuse

  24. Thank You For more information: peter.allain@la.gov ABMB.com

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