diverging diamond interchange workshop presentation - ddi.pdf · 2013. 3. 6. · partially...

DDIs – Fillmore and BeyondSmith Siromaskul

CO/WY ITE – March 2013

A B I T O F F I L L M O R E H I S T O R Y

» Introduced as a concept for Fillmore interchange in Fall 2009

• Only 1 DDI was open to traffic at that time

» MO 13 opened June 2009

» Pioneer Crossing opened in August 2010

» The floodgates have since opened…

H E R E , T H E R E , E V E R Y W H E R E

H E R E , T H E R E , E V E R Y W H E R E

» Used for high volumes of turns

» Typically requires fewer lanes

» Possibly costs less

» Generally looks cool

» Concerns with corridor operations

T H E B I G P I C T U R E

T H E R E G O E S T H E N E I G H B O R H O O D

» Difficulties with nearby signals

» Access issues

» Signal coordination issues

» Operational and queuing issues

D D I W I T H E M B E D D E D G R E E N T

» I-75 at Windy Hill – Atlanta Metro Area

W O R K I N G W I T H C L O S E LY S PA C E D I N T E R S E C T I O N S

» I-15 at 2600S – Bountiful, UT

S P L I T T I N G T H E F L O W

» Lots of left turn storage

» Three structures

» Three roadways (2 EB, 1 WB)

S E C L I N , F R A N C E A D VA N C E D L E F T T U R N D D I

Advanced Left Turn DDI / I-75 at SR 70 – Sarasota, FL

S P L I N T E R E D 1 3 - L A N E D D I

H O W T O B R E A K A D D I

S P L I N T E R E D S I G N A L P H A S I N G O P T I O N

I T S TA R T S W I T H A S T U P I D Q U E S T I O N …

» Why not untwist the middle?

S P L I N T E R E D D D I V 2

» Why not untwist the middle?

S P L I N T E R E D D D I V 2

A N I N T E R S E C T I O N T O O C L O S E …

N

Bee Ridge Road

Cat

tle

me

n R

oad

Movement LOS (AM / PM) Delay (AM / PM) Queue (AM / PM)

SB I-75 to WB Bee Ridge D / F 45.3 / 140.4 800 / 850

WB Bee Ridge to SB Cattlemen F / F 169.1 / 245.1 950 / 1,000

NB Cattlemen to EB Bee Ridge F / F 284.4 / 170.4 1,700 / 1,700

EB Bee Ridge to NB I-75Movement fails due to limited ramp capacity

[1,450 volume / 1,000 capacity]

NB I-75 to WB Bee Ridge F / F 120.6 / 262.5 1,650 / 1,700

SB Cattlemen to EB Bee Ridge F / F 396 / 363.7 1,700 / 1,700

EB Bee Ridge at Cattlemen F / F 211.4 / 125.9 1,700 / 1,700

F I X T H E I N T E R S E C T I O N , F I X T H E I N T E R C H A N G E

Movement LOS (AM / PM) Delay (AM / PM) Queue (AM / PM)

SB I-75 to WB Bee Ridge C / C 22.2 / 22.3 200 / 200

WB Bee Ridge to SB Cattlemen B / B 10.5 / 17.7 50 / 100

NB Cattlemen to EB Bee Ridge C / D 31.4 / 37.2 500 / 500

EB Bee Ridge to NB I-75Movement fails due to limited ramp capacity

[1,450 volume / 1,000 capacity]

NB I-75 to WB Bee Ridge C / C 32.5 / 31.3 500 / 600

SB Cattlemen to EB Bee Ridge E / E 64.2 / 56.1 400 / 200

EB Bee Ridge at Cattlemen D / C 49.8 / 28.2 750 / 400

N

PA R T I A L LY S P L I N T E R E D D D I /C O N T I N U O U S F L O W I N T E R S E C T I O N

Movement LOS (AM / PM) Delay (AM / PM) Queue (AM / PM)

SB I-75 to WB Bee Ridge C / C 22.2 / 22.3 200 / 200

WB Bee Ridge to SB Cattlemen B / B 10.5 / 17.7 50 / 100

NB Cattlemen to EB Bee Ridge C / D 31.4 / 37.2 500 / 500

EB Bee Ridge to NB I-75 C / B 20.5 / 16.8 425 / 350

NB I-75 to WB Bee Ridge C / C 32.5 / 31.3 500 / 600

SB Cattlemen to EB Bee Ridge E / E 64.2 / 56.1 400 / 200

EB Bee Ridge at Cattlemen D / C 49.8 / 28.2 750 / 400

PA R T I A L LY S P L I N T E R E D D D I /C O N T I N U O U S F L O W I N T E R S E C T I O N

C O N TA C T I N F O R M AT I O N

Smith Siromaskul, P.E.

1001 SW 5th Avenue #1800

Portland, OR 97204

smith.siromaskul@hdrinc.com