design versus planning presented by: bill kenny, director, highway design, project management and...
TRANSCRIPT
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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.
Didsbury
Carstairs
Bergthal Road
Red Deer
Calgary
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![Page 5: Design versus Planning Presented by: Bill Kenny, Director, Highway Design, Project Management and Training Section, Technical Standard Branch](https://reader036.vdocuments.us/reader036/viewer/2022070410/56649ef15503460f94c01854/html5/thumbnails/5.jpg)
Functional Planning Study
• 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
Hwy 2
Bergthal Road
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Functional Planning Study (Con’t)
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Functional Planning Study (Con’t)
Northbound
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Functional Planning Study (Con’t)
Southbound
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Functional Planning Study (Con’t)
Westbound
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Functional Planning Study (Con’t)
Eastbound
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Functional Planning Study (Con’t)
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Functional Planning Study (Con’t)
Ultimate stage layout and ramp terminal intersection layout – WSB&ENB LT bays on Bergthal Road;
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Functional Planning Study (Con’t)
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 (Con’t)
• 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 (Con’t)
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 (Con’t)
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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?