the basics of cfi abmb cfi.avi at-grade intersection left-turns happen in advance of the main...
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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
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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
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CFI Efficiency
Conventional 4-lane roadway
650 v/l/h x 4 lanes = 2600 v/h
C=150 P.M. Peak
650 650
650 650
CFI 4-lane roadway
850 v/l/h x 4 lanes = 3400 v/h
C=120 P.M. Peak
850 850
850 850
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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
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More History 2002 -- LADOTD and ABMB Began Discussing
Possible CFI Applications Construction of the Airline / Siegen CFI Began in
the Summer of 2005 Then …
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Katrina…04/22/23 7
Katrina...
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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
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Design Volumes
(Projected 2004)
Post – Katrina Volumes(May 8, 2007)
846
592
575
432
Free 1638 128
327 1022 285
57
428
361
1599 1634
1766
5845
Free 1913 153
317 1201 318
342
667
327
104
537
310
951
1336 1836
2366
6489
Air
lin
e
Hw
y.
Siegen Lane
Sherwood Forrest
Air
lin
e
Hw
y.
Siegen Lane
Sherwood Forrest
-42%
16%
-24%
17% 20%
-3% 18% 12%
82%
25%
-14%
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March 21, 2006 – Opening Day
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The Bad News Actual Volumes Much Higher Than Design Volumes
Katrina “Avoiders” Returned to Intersection
Unbalanced Increases Made Timing Adjustments Challenging
The Good News Operations Greatly Improved
Travel Times down 40% Average Delay Less than ½ Previous
Driving Public Satisfaction Safety
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Cumulative Accident Data: Cumulative Accident Data: Twelve Month Period Twelve Month Period (March-March)(March-March)
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Cumulative Accident Data: Cumulative Accident Data: Six Month Period Six Month Period (March-September)(March-September)
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Preliminary Safety Analysis
Total Accidents Down 25%Serious Accidents Down 34%
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Misconceptions
Confusing to Drivers What if the Power Goes Out?
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Public Acceptance
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Day Before Opening
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4 months later
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The Advocate 05.20.2006
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The Advocate
07.11.2006
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Public Acceptance Survey
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Public Acceptance SurveyQuestion 3a: State below whether you think the improvements make TRAFFIC CONGESTION Better, Worse, or the Same…
433
1347
0
50
100
150
200
250
300
350
400
450
Better Worse Same
Traffic Congestion Traffic Congestion
87%
3% 10%
Better
Worse
Same
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Public Acceptance SurveyQuestion 5. Please indicate your level of satisfaction with the current traffic conditions of the intersection.
291
10063
2912
0
50
100
150
200
250
300
Level of Satisfaction Level of Satisfaction
59%20%
13%6% 2%
Extremely Satisfied
Somewhat Satisfied
Satisfied
Unsatisfied
Extremely Unsatisfied
92% 92% SatisfiedSatisfied
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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 20062. CFI – Bangerter at 3500 South, Salt Lake City Utah, construction starts early 20073. DDI – Kansas City, Missouri
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Where is CFI Today?
Louisiana – 1 Open, 8 studied or currently under study1. Airline Highway at Siegen Lane (Open)2. Airline Highway at Goodwood, Old Hammond, Bluebonnet, Jefferson3. Florida Boulevard at Sherwood Forest Boulevard4. Alexandria Traffic Circle5. Ambassador Caffrey Parkway at Johnston Street
6. Statewide Study on-going, All Districts (90+ Intersections)
Maryland – 1 operational, 6 studied or currently under study
MD 228 at MD 210 (operational)1. MD 140 Corridor Study – 7 intersections / 3 CFI’s2. US 29 at Stewart Lane / Eden Lane3. MD 140 at Painters Mill Road4. MD 213 at US 40
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Mississippi – 1 Under Construction, 1 Under Design1. US 61 at Junkin Drive (Under construction, 2010 Opening)2. US 49 at State Route 53 (Final Plan Stage)3. US 61 at Devereaux Road4. Jackson at State Route 6
Ohio – 1 Under Construction, 1 Under Design, 5 studied or currently under study
1. Austin Pike at State Route 741 (Under Construction)2. Beachmont at 5-Mile (Preliminary Design)3. Columbus Pike at Powell Road4. Brice Road at Scarborough / Tussing Boulevard5. State Route 32 at Glenestre6. State Route 32 at Bells Lane7. State Route 32 at Baur Road
Utah – 1 Open to Traffic Bangater Hwy at 3500 South
Arkansas - 1 studiedShackleford Highway at I-630 / Financial Center ParkwayStatewide Study on-going
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