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SR 92 DDI
1. I-15/Timpanogos Highway (S.R. 92)
Diverging Diamond Interchange (DDI) Retrofit
(Now Called Double Crossover Diamond (DCD) by FHWA)
May 9, 2012
Michael Lasko, PE
Brad Hartman, PE
Brian Michels, PE
801-350-5200
2. Timpanogos Highway (SR-92)/I-15
Double Crossover Diamond Interchange (DCD) Retrofit
Replace existing tight diamond I/C to a double crossover diamond I/C
Public Outreach – Design Development and Construction
Geometric footprint and drainage to fit within existing I-15/SR-92
right of way
Traffic Operations
Minimize impacts to utilities
Signing, Striping, and Traffic Signals
Maintenance of Traffic during construction
3. Public Outreach – Design Through Construction
Key Part of the Team
Public Outreach Team attended
design and construction
coordination meetings
Enabled better public awareness
in advance of and during
construction
Website:
http://www.udot.utah.gov/sr92/
Design/Build Liaison
4. Roadway Design
Benefit/Cost – 15+ yrs at $7.9M
Driver Perception
Channelization, Sight
lines, Barriers, Curbing, Signage, Glare
Match Existing Infrastructure (ie
ramps, structures)
I-15 over SR-92 Vertical Geometry
Accommodation for Pedestrian Movements
Utilize Existing Pavement
Enabled more efficient MOT setups during
construction
Minimized construction costs
5. Traffic Operations
FHWA Interchange Access Change Request Acceptance
Geometrics and Signing Plans and Traffic Models
Travel Demand Model Future Forecasts
Affects operations, geometrics, storage
Utilize Right Modeling Tools
Synchro – Lower cost/Less Effective VISSIM – Higher cost/Very
Effective
Maintenance of Traffic
Iterative process – MOT Options vs. Modeling/Contract Requirements
Two Phase I/C Results in Better Efficiency
Careful consideration required with adjacent intersections
2030 PM Peak SB Ramp Terminal 45% Delay reduction (75s to 41s)
8. Minimize Utilities Impacts
Complete Interlocal Agreements
Continual coordination with utility operators
Pothole and survey existing utilities prior to design
Develop utility plan
Utility coordinator/Engineer
9. Signing, Striping, Traffic Signals
Signing Balance
Avoid over signing the DCD
Keep signing simple
Manage Vehicle Throughput and I/C Capacity
Consistency w/Operational Analysis
Stop bar placement, Ramp Meters, Shoulders/Shy Distances
Lane widths
Speed
Involve Region Traffic Signal Inspector
Signal Head Placement
10. Maintenance of Traffic during Construction
Conduct dry runs and
brainstorming sessions with
Contractor, UDOT, Designer
Minimize impacts to LOS by
utilizing night time/weekend
construction operations
Utilize operational efficiencies
of DCD as soon as possible
Utilize temporary elements
Be diligent and flexible during
construction activities
11. Summary
Double Crossover Diamond Retrofits Benefits:
Maximizes Traffic Operations at a Lower Cost
• FHWA and UDOT Supports the use of DCD Retrofits
Reduces Travel Delays
Extends Interchange Life
Improves Safety – Drivers are More Perceptive
Other States Following UDOT’s Lead
• Ohio, Illinois, Kansas