Case Study #2 for UTCM Report #08-14-03 "Making Mobility Improvements a Community Asset: Transportation Improvements Using Context-Sensitive Solutions"
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Project 2 north central expy-high 5 interchange 092210
1. Project 2
North Central Freeway (US 75) and High
Five Interchange Reconstruction
Dallas, Texas
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2. North Central Expressway
Constructed 1947 (4-6 lanes)
Capacity exceeded after about 10
years
Initial planning for more capacity
Started in early 1970s
More lanes in existing ROW
Double deck (similar to Austin I-35)
Broadly opposed (twice)
Noise
Aesthetics
Maintenance of traffic concerns
ROW acquisition
By 1980, congestion 12 hours/day
NCE near Walnut Hill looking south toward downtown in 1959. Source:
http://www.texasfreeway.com/dallas/historic/photos/images/us75_central_walnut_hill_looking_south_2_1959.jpg
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3. North Central Expressway
Same segment 29 years later (before improvement)
NCE near Walnut Hill looking south toward downtown in 1988. Source:
http://www.texasfreeway.com/dallas/historic/photos/images/tti_us75_walnut_hill_may_88.jpg
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4. Collaborative Approach – Early 1980s
North Central Task Force
City of Dallas
TxDOT
Chamber of Commerce
DART
Property owners
Business leaders
Elected officials North Central Task Force Organization. Source: North
Central Task Force reports
Initiated North Central Project (~10 miles)
10 miles
Collaborative
Consensus plan
Meet corridor objectives, concerns
Led by C of C Transportation Committee chair
Nationally respected project manager
Multidisciplinary deign team 4
5. Ultimate Proposal
8+ lanes
At-grade and depressed sections
Extensive retaining wall to reduce
ROW needs
Cantilevered frontage roads
(some)
LRT in tunnel under frontage road
Aesthetics package (renowned
architect) Typical cross-sections: north, central, south
sections
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6. Features –
Before and After
Section of NCE at Northwest Highway interchange showing
existing and improved configurations (visualization).
Source: Regional Mobility Initiatives, NCTCOG, Vol. 11, No.
1, July 1997.
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9. Features
DART LRT line at north end of tunnel under NCE. Source: Regional Mobility
Initiatives, NCTCOG, Vol. 11, No. 1, July 1997.
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10. “High Five” Interchange
Project
Last part of NCE project
Followed NCE north and south of I-635
Delayed due to cost and funding
Full replacement
Before reconstruction. Looking south on US 75 at I-635. Source: TTI 10
11. Project Components
Fully directional high speed ramps
NCE widened to 8 basic lanes
Accommodate wider I-635
Include HOV ramps
Maintain existing number of lanes during
construction
Issues
Construction duration
Impact of construction on businesses
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12. CSS Solution
Collaboratively discuss needs and possible solutions
Extensive public outreach
Reduce construction duration
Innovative construction techniques
Contractor flexibility to innovate
Incentives/disincentives
Night construction
Off-site pre-casting
Maintenance of traffic
Existing number of lanes during day
Coordinate other improvements with High Five
schedule
Photo: Segment erector technology. Source: http://www.urbantransport-technology.com/projects/dallas_1/dallas_19.html 12