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