5. Pioneer Crossing Design Build Project
The ATC Process (Alternative Technical Concept)
ATC #1: Diverging Diamond Interchange
A little history
DDI drivers:
Innovation
Heavy Left Turn Movements
Project Savings
ROW
Fill/Embankment
Structure Area (sq. ft.)
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6. Design Build Innovation
Why ATC # 1
Allowed interchange to remain at original Skew
Accommodated the heavy left turn movements
Provided efficient phased construction of
bridges over I-15
Construction cost savings
Reduced Right-of-way (as compared to RFP SPUI)
Minimized User Costs (delays, detours, etc.)
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7. Do Your Homework
ATC # 1 Engineering
Development
Traffic Modeling
VISSIM
Design Issues
RFP-SPUI layout
Vineyard Connection (future)
Construction Quantities
FHWA; IAJR-Interstate Access Justification Report
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8. Add Value to the Project
ATC # 1 Approval
Increased Interchange efficiency
Better Level of Service
Decrease congestion and delay
Smaller bridge footprint
Faster construction
Reduced user costs
MOT benefits during construction
Traffic maintains existing patterns
Simple traffic switchovers and phasing
Reduced construction and user costs
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13. Don’t forget Pedestrians
Outside
Similar to a SPUI
Center
Advantages
Crosswalks controlled by signals
Disadvantages
Unfamiliar
More lanes to cross
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14. Opening a new DDI?—You better have a plan
Public Information
Fears
Wrong way vehicles
Public Acceptance
Messaging
Commercials
DDI A dv ertisement.w mv
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15. How much do you know ?
Like all good engineering, the DDI design was
developed by German engineers?
The I-15/American Fork Main Street DDI is the first in
the USA built from the ground up?
A DDI requires less square footage of bridge deck
which will provide project cost savings?
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16. Is it: FACT or CRAP ?
DDI’s accommodate left turn movements while
eliminating the need for left turn signals?
A DDI will increase potential safety conflict points?
Use of a DDI on the Pioneer Crossing provided $20
million in cost savings to the project ?
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