Design versus Planning

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Design versus Planning
Presented by Bill Kenny, Director, Highway
Design, Project Management and Training Section,
Technical Standard Branch
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What is the difference between Design and
Planning?

• Objectives purpose
• Time Frame
• Design Parameters
• Tools
• Output - documentation

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Case Study Bergthal Road Interchange on Highway
2.
Red Deer
Didsbury
Bergthal Road
Carstairs
Calgary
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Functional Planning Study
Hwy 2

• 2008, a FPS by consultant at the proposed
  interchange location
• Highway 2 between Calgary and Edmonton, freeway
  standard
• Projected AADT in the year of 2026

Bergthal Road
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Functional Planning Study (Cont)
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Functional Planning Study (Cont)
Northbound
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Functional Planning Study (Cont)
Southbound
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Functional Planning Study (Cont)
Westbound
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Functional Planning Study (Cont)
Eastbound
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Functional Planning Study (Cont)
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Functional Planning Study (Cont)

• Ultimate stage layout and ramp terminal
  intersection layout WSBENB LT bays on Bergthal
  Road

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Functional Planning Study (Cont)

• Cost Estimates
• Stage 1 Flyover 28.6 million
• Stage 2 Diamond additional 12.2 million, and
• Ultimate Stage Parclo A additional 15.6
  million
• In total CAD 56.4 million in 2007 dollars

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AT Detailed Design

• Based on the projected AADT, simple diamond
  interchange works well after 20 years.
  Stop-controlled intersections at ramp terminals.
• In the long term, dumbbell interchange with
  2-lane roundabout at each ramp terminal.

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AT Detailed Design (Cont)

• Narrow the structure width
• Purchase enough land to accommodate the future
  dumbbell interchange footprint
• Roundabouts are safer if signals are required in
  the long term

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AT Detailed Design (Cont)

• Construction cost estimate
• Common excavation 381,000 m3
• Borrow excavation 794,000 m3
• GBC 86,000 t
• ACP 35,000 t
• Total cost 22 millions in 2011 CAD, compared to
  the FPS 28.6 millions for the flyover in stage
  one 40.8 millions for the simple diamond
  interchange and 56.4 millions for the Parclo A
  interchange

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AT Detailed Design (Cont)
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QUESTIONS?
Basic layout and land acquisition protects for
future growth.
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Lesson Learned

• Plan and Design according to the travel demand
• Design must meet current Design Guidelines
• Apply Economic Analysis principles to design
• Negotiate/agree with landowners at Planning
  stage
• Do more detailed geotechnical study at Planning
  stage to avoid long distance borrow sites.

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Highway 63 Twinning- differences between
planning and design

• Due to low AADT and budget constraint
• Defer service roads
• Allow direct access temporarily
• Eliminate cross-overs
• Eliminate intersection treatments for single use
  accesses
• Minimize realignment to reduce utility
  relocations
• Reduce roadway width

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Proposed width at time of construction 12.4m
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Width after one 80 mm overlay
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Conclusion

• Designers need to re-examine findings in planning
  study.
• Look for efficiencies while preserving
• safety,
• functionality and
• flexibility for unpredictable future
  developments.
• Questions?