the basics of cfi abmb cfi.avi at-grade intersection left-turns happen in advance of the main...

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

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

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

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

More History 2002 -- LADOTD and ABMB Began Discussing

Possible CFI Applications Construction of the Airline / Siegen CFI Began in

the Summer of 2005 Then …

Katrina…04/22/23 7

Katrina...

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

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%

March 21, 2006 – Opening Day

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

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

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

Preliminary Safety Analysis

Total Accidents Down 25%Serious Accidents Down 34%

Misconceptions

Confusing to Drivers What if the Power Goes Out?

Public Acceptance

Day Before Opening

4 months later

The Advocate 05.20.2006

The Advocate

07.11.2006

Public Acceptance Survey

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

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

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

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

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

Questions

www.abmb.com

Laurence Lambert, P.E., PTOEllambert@abmb.com