DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ......
Transcript of DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ......
![Page 1: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/1.jpg)
DDIs – State of the Practice and the Next Evolution
Smith Siromaskul
![Page 2: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/2.jpg)
O V E R V I E W
![Page 3: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/3.jpg)
C O N C E P T U A L O V E R V I E W
![Page 4: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/4.jpg)
DDI Sites
![Page 5: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/5.jpg)
» Used for high volumes of turns
» Typically requires fewer lanes
» Possibly costs less» Generally looks cool
T H E B I G P I C T U R E
![Page 6: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/6.jpg)
A W O R D O F WA R N I N G
» Concept to 15% Design
![Page 7: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/7.jpg)
N O N - P E R P E N D I C U L A R C R O S S I N G A N G L E
» Crossroad alignment driven by structure cost
» No need to achieve a perpendicular crossing can mean MUCH less right-of-way with a DDI
![Page 8: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/8.jpg)
Pioneer Crossing DDI Intersection
![Page 9: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/9.jpg)
I N T E R I O R A N G L E
![Page 10: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/10.jpg)
S I G N I N G A N D PAV E M E N T M A R K I N G S
Signing & Pavement Marking
Monotube Option
Signing & Pavement Marking
Overhead Signage
![Page 11: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/11.jpg)
P E D E S T R I A N S – O U T S I D E T R E AT M E N T
• Pedestrian Travel Paths
• Bicycle Travel Paths
![Page 12: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/12.jpg)
P E D E S T R I A N T R E AT M E N T
» Common practice to keep pedestrians to outside» Conflicts with left turn onto entrance ramp» Unsafe condition with limited sight distance
NUniversity Parkway
![Page 13: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/13.jpg)
P E D E S T R I A N T R E AT M E N T
» No conflict with left turns» Barrier-protected sidewalk» 80-90% public approval
NUniversity Parkway
![Page 14: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/14.jpg)
» Significant pedestrian volumes are present
» Turning roadways have more than one lane
» To eliminate weaving issues
S I G N A L I Z E D M O V E M E N T S
![Page 15: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/15.jpg)
O F F R A M P R I G H T T U R N O P T I O N S
![Page 16: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/16.jpg)
Cheyenne, WY
![Page 17: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/17.jpg)
Cheyenne, WY
![Page 18: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/18.jpg)
F L L E S S O N S L E A R N E D
![Page 19: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/19.jpg)
F L L E S S O N S L E A R N E D
Model
West Ramp Terminal East Ramp TerminalAM Peak PM Peak AM Peak PM Peak
Delay LOS Delay LOS Delay LOS Delay LOSSynchro 24.2 C 42.2 D 31.9 C 23.6 BVISSIM 18.4 B 17.9 B 13.3 B 12.8 B
![Page 20: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/20.jpg)
T H E N E X T E V O L U T I O N
» Splintered Diverging Diamond Interchanges» Here’s where it gets weird…
![Page 21: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/21.jpg)
O N C E U P O N A T I M E I N F L O R I D A
![Page 22: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/22.jpg)
E X I S T I N G V O L U M E S
![Page 23: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/23.jpg)
P R O J E C T E D V O L U M E S
![Page 24: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/24.jpg)
T Y P I C A L D D I L AY O U T - U N I V E R S I T Y PA R K WAY
» Median pedestrian treatment» Pavement slope concerns» Uncertainty of future volumes
NUniversity Parkway
![Page 25: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/25.jpg)
D I F F E R E N C E S
» Existing (2012 counts)
» Design Year (2034)
![Page 26: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/26.jpg)
W H AT ’ S N E A R B Y
![Page 27: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/27.jpg)
C H O O S I N G A D E S I G N
» Need for excess capacity, within reason» Mitigation for pavement sloping issues» DDI Variants
![Page 28: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/28.jpg)
Colorado Springs, CO
![Page 29: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/29.jpg)
» Three structures» Three roadways (2
EB, 1 WB)
A D VA N C E D L E F T D D I – S E C L I N , F R A N C E
![Page 30: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/30.jpg)
Advanced Left Turn DDI / I-75 at SR 70 – Sarasota, FL
![Page 31: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/31.jpg)
A D VA N C E D L E F T T U R N D D I
![Page 32: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/32.jpg)
Splintered DDI / I-75 at SR 70 – Sarasota, FL
![Page 33: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/33.jpg)
K E Y D I F F E R E N C E S
![Page 34: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/34.jpg)
Colorado Springs, CO
![Page 35: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/35.jpg)
Splintered DDI / I-75 at SR 70 – Sarasota, FL
![Page 36: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/36.jpg)
V O L U M E S C E N A R I O S
![Page 37: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/37.jpg)
F I N D I N G F L A W S I N A D I A M O N D
Scenario
Typical DDI Splintered DDI
EB Thru SB Left Overall EB Thru SB Left Overall
Scenario 1 60.5 39.7 33.0 63.4 23.1 37.6
Scenario 2 133.2 87.9 61.3 63.4 28.6 37.2
Scenario 3 171.0 155.5 82.3 63.3 52.9 42.0
Delay in seconds per vehicle through the entire interchange area
![Page 38: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/38.jpg)
S U M M A R Y
Advanced left DDI» Improves core lane utilization» Separation of crossroad left queue
» Splintered DDI » Large number of lanes» Excessive internal queuing» Left turns from ramps» Unbalanced lefts
![Page 39: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/39.jpg)
Braided Splintered DDI / I-75 at SR 70 – Sarasota, FL
![Page 40: DDIs – State of the Practice and the Next Evolution · the big picture. a word of warning ... vissim 18.4 b 17.9 b 13.3 b 12.8 b. the next evolution ... eb, 1 wb) advanced left](https://reader031.fdocuments.net/reader031/viewer/2022022600/5b3cb2f77f8b9a26728d8970/html5/thumbnails/40.jpg)
C O N TA C T I N F O R M AT I O N
Smith Siromaskul, P.E.1001 SW 5th Avenue #1800Portland, OR [email protected]